The largest greenhouse in the world is home to over one million types of plants.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

One of England's most famous churches hides a pair of little known architectural treasures.

This colossal war machine is now a living museum dedicated to underwater warfare.

This striking observation tower shaped like a spinnaker sail is the newest icon in historic Portsmouth.

Regency-era excess on the English Coast.

London's old-school healing garden.

A large-scale steel sculpture entitled 'The Shadow Boxer' pays tribute to Nelson Mandela.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

This bridge was constructed from the rubble of the infamous Bastille.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

Peeing dogs guard the Roman hunting goddess atop a fountain at France’s Château de Fontainebleau.

Pompeii's less famous neighbor is still revealing her secrets.

The world's most active stratovolcano is almost always erupting.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

Ruins of a 10th century church tucked away deep in a botanical garden.

The Emperor Tiberius' palace of debauchery.

Beautiful views and Roman-style statues on the Italian coast.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Erotic art covers the walls of the largest ancient pleasure palace.