A former Latvian headquarters of the brutal KGB secret police is now open as a grim reminder of their atrocities.

3,000 market stands in five former Zeppelin hangars.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

The oldest church in the Estonian capital is home to over 100 fantastical cemetery coats-of-arms.

"There's nothing there," and other lies the KGB told us.

Disused seaplane hangar gets a second life as the jaw-dropping home of Estonia's museum of maritime history.

A subterranean house of worship carved right out of the bedrock.

A monument to the defenders of the Arctic in Murmansk, Russia.

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

18th century opera in its original splendor.

Swedish skyscraper with a 90° twist.

This chimerical bridge/tunnel appears to dead end right into the sea.

Copenhagen's celebrated theme park and gardens.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

Old Danish castle immortalized in Shakespeare's Hamlet.

Mounds, rune stones, and a 1,000-year-old church, left behind by Denmark's first two kings.

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

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

The "Prussian Versailles" that is as glorious today as when it was built.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

The oldest botanical garden in the world that technically isn't the oldest.

Pilgrimage site for star-crossed lovers.