An abandoned football stadium with a tragic past.

The only museum with its curator—and her pets—buried inside.

This former KGB building is now a museum memorializing the people who suffered during the Soviet regime.

This charming Latvian lane doubled as Baker Street on the Soviet Union’s version of Sherlock Holmes.

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

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

Architecturally stunning library serves as the hub of Finnish scholarly life and culture.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

The house that took a plunge into the facade of a museum.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

Op-art architecture designed for happiness.

A golden plaque marks the site of the mysterious unsolved assassination of the former Swedish prime minister.

Stockholm's narrowest alley is barely over two feet wide.

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

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

The former headquarters of history's oldest megacorporation.

An old department store turned Nazi prison turned artist commune.

This classic restaurant features a gorgeous mirror-clad room.

This monumental work of art symbolizes the coming together of a previously divided city.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

Metro station with a claim to rock n' roll fame.

Tiny memorials honor individual victims of the Holocaust.