The Mona Lisa was painted in the year 1503 by Leonardo Da Vinci. The painting's eyes are very famous because they seem to follow you around the room!

Can you be as keen-eyed as the Mona Lisa and find a dog, a bird, a turtle, a child, and a book in the following paintings? Scroll down to find out the answers...

Can you find a dog in this illustration from 17th Century Japan? Click here and then use the zoom tool to search, then come back to this story and scroll down for the answer.

The dogs are here playing inside with their families! There are over 1,800 people in this picture of everyday life in the city of Kyoto, so well done if you managed to find these little pups.

Can you spy a little bird in this picture? Click here to search.

There are a few perching here on this roof...

...and a couple of roosters crowing down near the bottom! The picture shows a group of people arriving in a port by boat, welcomed by crowds of people, dogs and birds.

This tapestry is inspired by a book called The Hobbit, and includes dragons, eagles, and even Gollum. But can you spot the humble turtle? Click here to search.

The turtle is over here in Lake Town Harbor, next to a blue barrel! Have you read the book of Bilbo's adventure?

This is a really tricky one. Can you spot a young child in the crowd? Click here to look closer.

The little boy is here, on the balcony with the musicians. This is actually a depiction of the composer Mozart when he was a young boy! He's looking right at you. Have you just walked into the room to join the wedding feast?

There are lots of books in this painting, but did can find one by someone called Ovid? Click here and see.

High in the Central Balkan Mountains of Bulgaria, Buzludzha Peak is the site of many significant events in Bulgarian history, including the first congress of the Bulgarian Social Democratic Workers Party in 1891.

In 1974, the Buzludzha Monument was constructed here, in concrete and shining glass mosaics, to commemorate that moment of history and the people who made it possible.

Even today its architecture feels futuristic, like a space ship from another world. Though it's officially closed, the monument remains a favourite of urban explorers in Eastern Europe.

The former German colony of Kolmanskop became the centre of the Namibian diamond rush in 1908, when a worker named Zacharias Lewala found a small rough diamond.

Over the next few years, the town and its wealth grew. There was soon a hospital, ballroom, power station, school, skittle-alley, theatre and sports hall, casino, ice factory and the first tram system in Africa.

When the diamonds ran out, and a new patch was discovered some 270km south, many of the town's inhabitants simply packed up and left. In the years since, the desert sands have swamped the town.

Nicknamed the 'Chicken Church', this iconic prayer hall in the Javanese jungle was left unfinished, abandoned for years, until it found Internet fame.

Daniel Alamsjah devoted his life to building the multi-faith prayer hall after a religious vision. Designed to resemble a holy dove, many locals thought it looked more like a chicken.

Alamsjah ran out of money and faced ridicule for his design, until the strange structure was picked up by international media in 2015. The tourists his unique building attracted allowed him to carry on construction.

The dry, dusty town of Uyuni, Bolivia, has long been one of South America's most important transport hubs. But today it's best known as the final resting place of hundreds of steam engines.

Many of these were imported from Britain during the 19th Century, when there were plans to expand the continent's transport network.

But the collapse of the mining industry left many bankrupt and those plans in disarray. Instead of paying to move the the trains, they were simply left to be eaten up the harsh winds of the salt flats.

All is not as it seems at this ominous castle near Łapalice, Poland.These rotting ruins are actually still under construction.

Artist Piotr Kazimierczak only started building this structure in 1971. It was planned to be his personal studio, complete with swimming pools, ballroom, and twelve towers.

However his lofty ambitions met with some major problems: he ran out of money shortly after building the walls, and it turned out he'd built part of the castle on land he didn't own. Construction stopped, and local curiosity grew.

Built in 1971 and designed by architect Boris Magaš, this luxurious hotel on the Croatian island of Krk last welcomed guests in 2001. Today, while the building remains intact, the sci-fi interiors are destroyed.

The high, geometric ceilings, and white curving concrete mark this building as a modernist marvel. The hotel's casino, cocktail bar, swimming pools and saunas defied western expectations of eastern European hospitality.

Unfortunately, as the Yugoslav Wars broke out in the 1990s, the tourism industry collapsed. Throughout the conflicts, the hotel became home to refugees. The business never recovered, and closed in 2001.

This small British island in the southern Atlantic Ocean, not far from Antarctica, is quiet today, but was once the site of major sealing and whaling stations. Thankfully, the ships are now gone, and the wildlife is safe again.

At first sight, this lone 14th-century bell tower, found near the village of Graun in northern Italy, doesn't appear like much...

...but it's the sole surviving building of the old village which, along with the nearby village of Reschen, was deliberately flooded in 1950 during the building of the artificial Lake Reschen.

When water levels are low or when ice covers the lake in winter, you can walk all the way up to the tower itself. Local legend says that on quiet nights you can still hear the ghostly ringing of bells.

The hill town of Craco in southern Italy, dates back nearly 1000 years, but was abandoned at the end of the twentieth century after a series of devastating landslides.

The evacuation of the town began in 1963 after a number of landslides, with many of the inhabitants moving down into the valley. In 1972 a flood damaged even more buildings, and in 1980 an earthquake destroyed what little was left.

The striking silhouette of the hill town and its eerie ruins have since become a sight for tourists and film crews.

This artificial hill overlooking the city of Berlin was made shortly after the Second World War, when an unfinished technical college was covered with demolition rubble. The US military then built a radar station on top of the hill, to spy on Soviet communications.

The listening station, officially known as Field Station Berlin, was constructed in October 1963, and operated until the fall of the Berlin Wall and the end of the Cold War. The equipment was removed, but the structure and protective domes remained, waiting to be explored.

The dinosaurs were amongst the largest creatures ever to live on Earth. They dominated the land and the sea for three geological periods: the Triassic, Jurassic, and Cretaceous, a timespan of hundreds of millions of years. Experience them here in Street View and VR!

Did you know: there are fewer years between us and the last dinosaurs (65 million years), than the last dinosaurs and the first dinosaurs (approximately 178 million yeas).

Take a look the Brachiosaurus, or Giraffatitan as it's now known, at the Natural History Museum, Berlin.

Many people across the ages had found dinosaur bones, but it was only in the 19th Century, with the discoveries of William Buckland, that people began to think that they might be ancient lizards, rather than dragons or giants.

Buckland was the first to describe a dinosaur, which he named Megalosaurus. Before long, Iguanodon, was discovered by Mary Ann Mantell, who believed it resembled a modern iguana. This duck-billed Anatotitan was discovered in 1904 in central Montana by Oscar Hunter.

Discoveries were soon made across the world, and the fashion for all things prehistoric exploded. Dinosaurs play key roles in Jules Verne's 1864 novel Journey to the Center of the Earth, Sir Arthur Conan Doyle's 1912 book The Lost World, and the iconic 1933 film King Kong.

Tyrannosaurus rex may be one of the best-known of all dinosaurs, and while you wouldn't want to be stuck in a room with one, it was by no means the largest. Behind this skeleton at the Naturmuseum Senckenberg is the giant leg of a Supersaurus, truly one of the largest to exist.

For decades, scientists couldn't agree on how the dinosaurs were wiped out. Some suggested a massive volcanic eruption, others that they died of an infectious disease, or that mammals simply outcompeted them.

It was only in the 1980s, when the Chicxulub impact crater was discovered, that the theory of an asteroid impact became widely accepted. But today we know that not all were killed, some of their descendents live among us, having evolved over millennia into birds.

Ok, these aren't real, and by modern standards they aren't very accurate. But these concrete sculptures were the first dinosaurs many people saw, and they started the craze for these 'terrible lizards'.

They were made in 1854 for the Crystal Palace in Bromley, London. Since then, they've inhabited a small group of islands in Crystal Palace Park, and while they may look a little shabby today, they're loved by many, and protected as historic monuments.

Thanks for joining this journey of discovery. But before you go - what do you call a one-eyed dinosaur?


Do-you-think-he-saw-us?

The Lion of Venice is one of the most prized statues in the world, and one with a very unusual history. The lion has stood on a column in St Mark's Square, Venice, Italy, since around the 12th Century, and come to be recognised worldwide as a symbol of the aquatic city.

The winged lion is the traditional emblem of St Mark, the patron saint of Venice. But the Lion of Venice probably began life as a griffin statue on a monument to the god Sandon, in Cilicia, around 300BCE.

Over the centuries, the original bronze sculpture was repaired and modified, to create the Christian monument we see today.

Like the Lion, the founding of Venice is lost to history. All that's known is that the oldest families can trace their ancestors back to the late Roman empire, and that Paolo Lucio Anafesto, the first leader of Venice, titled the Doge, was elected in 697CE.

Well, we've landed somewhere, let's get looking for the lion. Stay on this slide and point & click to explore the city, and keep your eyes open.

Is it a bird? Is it a plane? No, it's a … griffin? Winged lion? Either way, it's the one we're looking for, and it's pride of place in the Piazza San Marco.

Next to the Lion is another column, this one holds the statue of Venice's other patron saint, Saint Theodore. Like the Lion, it's rather unusual, being made of several different sculptures, including a crocodile which represents a dragon.

Winged lions are almost everywhere in Venice. But the Lion did once leave the city. In 1797, after the defeat of Venice by Napoleon, the Lion of Venice was captured and taken to Paris. After Napoleon was deposed in 1816, it was returned home - with only a few missing parts.