The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

An ancient knight and a symbol of the city's freedom.

Macabre astrological automaton clock dating to the late 1400s.

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

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

Museum dedicated to the terror regimes of Hungary.

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

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

A 250-year-old timepiece-automaton adorned with golden mechanical birds, which still sing to this day.

An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

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

An abstract monument to a symphonic composer.

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

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

A dead saint, a deadly poison, and a mysterious holy ooze.

Caves famous for the dragon-slaying saint who lived there.

This monument to those fallen in the World Wars is accompanied by a U-boat that Germany bought for a Deutsche Mark.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

The 20-mile causeway that separates the Netherlands from the sea.

A Dutch clog company in the town of Zaandam loves the wooden shoes so much it made a museum for them.

Giant granite sculptures representing family on the northern coast of Spain.