Enter the world under the hill at this ancient UK burial chamber.

A sea cave with a waterfall and Viking past

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

An image of the legendary saint stands in the shadow of a cathedral she liberated.

France's high-tech, future-themed amusement park.

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.

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.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This strange statue features a bust of the famous composer plopped atop a woman's body.

The world's largest historic armory was established by independent citizens to defend themselves from the wars of larger forces.

The world's most important buildings shrunk to a tiny size.

Fantastic stories on a miniature railroad.

The shell of a medieval fortress offers commanding views of the area it once protected.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

Ride a dragon train into a world of dwarves.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Apartment complexes built into huge repurposed natural gas tanks.

Dine amidst exotic plants at this former royal greenhouse.