Relics from an era long gone, sit idle outside this Estonian museum.

This striking memorial is one of Estonia’s most controversial Soviet leftovers.

A spectacular Petrine Baroque summer palace commissioned for Catherine I by Peter the Great.

During the Soviet era, the spire of this longstanding church was used as a radio transmission tower.

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

A secluded art gallery hidden within the cellars beneath Tallinn’s medieval monastery.

Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

A rare octagonal brick beacon on an isolated island in the Baltic.

In the waters outside Helsinki, a tiny island once used as a military outpost now welcomes visitors.

An abstract monument to a symphonic composer.

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

An alien church provides much needed silence in the midst of a Finland shopping center.

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

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

For a brief time in 1960s France, families could climb into a tiny submarine and be pulled along an underwater journey.

A French library that makes sure its love of books is writ large... giant in fact.

An abandoned nightclub has become a vibrant work of art.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

This Bordeaux parking garage has 712 indoor spaces, and one outdoor.

The world's largest reflecting pool is just two centimeters deep.

The largest underground church in Europe.

Fighting the British and making game shows for over 150 years.

A massive, secret marina for the Nazis' most formidable weapon in the Atlantic.