Peace Park and the Atomic Bomb Dome.

Enormous pendulum helps keep Taiwan's tallest building from swaying.

The site of many tense prisoner exchanges across the Military Demarcation Line between North and South Korea.

Secret North Korean passage discovered below the world's most dangerous border.

South Korea's largely symbolic, barely used gateway to the North.

Home to more than 13,000 pieces of war memorabilia and military equipment.

An enormous and lavish Gothic church in Czechia.

A church of bones, decorated with 40,000 human skeletons.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

Looming communist pillar with a Czech twist.

A unique seaside cave where Aleister Crowley faked his own death.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

Blitzkrieg bop your way through Berlin's Ramones Museum.

A museum dedicated to a Cold War era sausage.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

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

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

This giant crucifix is like U2's Joshua Tree for Swedish death metal fans.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

Sweden's "good old days" painstakingly re-created in a model village.

It houses the remains of a 17th-century version of the Titanic.