A particularly disconcerting tribute to Irish martyrs.

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

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

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

Possibly the world's largest hourglass only needs to be reset every New Year's Eve.

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

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

Once the home of a hermetic monk, this cave now houses a small church.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Budapest's Communist-era statues, banished to the suburbs.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

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

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

This statue of a falling man commemorates a teenage martyr of the Hungarian Revolution.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

The deepest metro station in the world.