One of the largest, oldest, darkest, quietest motel rooms in the world.

Luxurious hotel designed to stir the imagination of its many visitors.

A son-and-daughter meat market, hawked by mom and dad.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

The beautiful baroque library of the Hapsburg empire.

Where the lovelorn find a home for their sentimental keepsakes.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

Home to items never before seen by the public.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

A posh members-only club with a literally dramatic history.

A semi-scholarly approach to sex.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

A celebration of capitalism in Midtown.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

This one-room museum is dedicated to Norwegian history and jokes.

Home to three historic ships from the age of Vikings.

A stunning silver lining to global warming's gloomy cloud.

A serpentine highway twists and turns over the treacherous Norwegian Sea.

This "preacher's pulpit" once used for pagan ritual, is home to a new, and dangerous ritual.

Walk 2,300 feet above the ground on the "Troll's Tongue."

This giant boulder is pinched over a 1000-meter abyss by two mountains.

A humid oasis combines recreation with exploration in a unique underwater cavern.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.