Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The most visited, and possibly most controversial, museum in Germany.

One of Ireland's most infamous prisons for rebels including men, women and children.

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The first mosque in the world to receive electricity.

Oriental bazaar in the heart of Sarajevo.

A monument on the pavement marks the spot where two cultures that shaped Sarajevo come together.

Walk through a restaurant's refrigerator door to reach this hidden bar.

One of the longest wooden benches in the world snakes around Geneva's Treille Promenade.

Where Mary Shelley’s 'Frankenstein' and John William Polidori's 'The Vampyre' were born.

At 929 pounds and 26 feet tall, this stainless steel fork can only be used by the likes of King Kong.

This colorful but controversial ceiling has been likened to a 21st-century Sistine Chapel.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

In the heart of Tirana, this underground nuclear bunker has been transformed into a museum.

A museum dedicated to secret surveillance.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

Hideout of thieves, monks, and goat-footed gods.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

This lesser-known Frank Gehry building houses a treasure trove of cinema history.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

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

This statue was given to France by the United States to commemorate the centennial of the French Revolution.