This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

Apartment complexes built into huge repurposed natural gas tanks.

Op-art architecture designed for happiness.

An ornate private entrance to the Vienna subway built specifically for the emperor.

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

Dine amidst exotic plants at this former royal greenhouse.

The final resting place for the remains of 143 Habsburg royalty.

A silly medieval mural preserved on the side of a Viennese house.

On a winding Vienna side street, one museum has turned their windows into a monument to history’s peace-minded heroes.

Housing the famous Norwegian ice-defying 19th century polar exploration ship.

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

A stunning architectural yet functional feat, towering over Oslo.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

The design of this beautifully crafted building was inspired by Norwegian glaciers.

This floating sculpture of ice is a poignant reminder of nature's power.

The struggle of a small Dutch island against the sea.

Home to the world's oldest functioning orrery.