Ahoy! So you want to join this boat? Well, you look a little wet behind the ears for a voyage. First, how about you get a sense of life on the rolling sea by visiting these nine museums of the deep ocean…

Have you closed the hatch? We're below deck on the HMAS Onslow, a Cold War submarine of the Royal Australian Navy. This submarine is kitted out for long patrols and special missions, but these days it sits above water in Sydney Harbour, the highlight of the museums' exhibits. The submarine is in nearly working condition, so how about you take a look around. Just don't touch the control panel!

Torpedoes, mines, submersibles, and gadgets are all on display at the Naval Undersea Museum at Keyport, Washington - the place to learn about the undersea operations, technology, combat, and research undertaken by the United States Navy.

Did you know there's a Smithsonian in Florida? The St. Lucie County Aquarium is home to the Smithsonian Marine Ecosystems Exhibit. Habitats from the deep Atlantic ocean to the shallow waters of the Indian River Lagoon are represented in fish tanks and models.

The balmy waters of the Gulf of Mexico are irresistible to undersea explorers. In Panama City, Florida, the Man in the Sea Museum tells the story of submersible exploration, from the heavy brass diving suits of the 19th Century to the US Navy's SEALAB I.

Located on the historic Stearns Wharf of Santa Barbara, California, the interactive exhibits of this museum of natural history offer everyone the chance to encounter a bewildering variety of sea life up close.

As you enter London's Natural History Museum, you're greeted by the skeleton of a gigantic blue whale - believed to be the largest animal that has ever existed. The museum is also home to many of the aquatic specimens collected by Charles Darwin on his famous Beagle voyage.

In the fishing town of Falmouth, in the English county of Cornwall, you'll find more than just fish and chips. The National Maritime Museum brings the the mysteries of the sea to the shore, and tells histories of local, national, and international significance.

For centuries the people of the city of Stralsund, on the north eastern coast of Germany, have roved the frigid Baltic sea. At the city's Ozeaneum you can learn how the sea was used for trading and fishing, and how scientists unlocked the secrets of its depths.

Thanks for joining this tour of the world's deep sea museums. Sadly, your ship has already sailed! You'll just have to heave-to and stay at the Ozeaneum with this surprisingly serpentine Oarfish. Anyway, you know what they say, worse things happen at sea!

The Colosseum, or the Amphitheatrum Flavium to any ancient Romans in the audience. This arena was built between 72-80CE, on the orders of Emperor Vespasian, to host the most important sports events of the calendar.

Emperors knew that they were safe when the Roman people had enough bread to eat and sport to watch. Amongst their favourites were gladiatorial matches, battle re-enactments, wild and exotic animal hunts, and public executions.

They say 'all roads lead to Rome', but which leads to the Colosseum? Stay on this slide, and point & click to explore the streets and find the Colosseum.

Here it is, how did we ever lose it? It might be looking a little shabby today, but that's what 2000 years of history tend to do to you. Let's take a look inside, you did bring the tickets didn't you?

Imagine stepping into this arena, 80,000 people cheering and chanting your name, underneath the floors are networks of tunnels and lifts to carry up beasts and men to the battlefield, and you await your fate.

Excuse me, did you say we're in the vomitorium? Yes! The Romans didn't actually like to throw up after meals, but they did use vomitoria. The word means 'a passageway that can be emptied quickly', like an emergency exit. So you can see where the confusion arose...