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

A collection of collections ranging from dentistry to minerals.

Sip creative cocktails in the former vault of the Riggs Bank.

A 2017 crowdfunding campaign saved this historic castle from being destroyed.

Created as a "model concentration camp" to hide Nazi atrocities from the international community, this former camp-ghetto now holds a museum and memorial honoring the lives lost within.

Crouch down, stretch tall, and be sure to flail your legs to pay homage to the Monty Python classic.

Nightmarish example of the unintended consequences of weapons testing.

Pictures tacked onto trees remember the more than 40,000 of Stalin's victims buried here in mass graves.

Descend 2,030 years into the past in an ancient tunnel built to support Jerusalem's most famous wall.

Ever-growing collection of devils in art.

The world's first invisible city square is an homage to a man who pushed the boundaries of art.

Described as one of the Baltic region’s most daring and original construction projects.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

This statue of a falling man commemorates a teenage martyr of the Hungarian Revolution.

Legions of Roman soldiers bathed in this ancient spa complex under a Budapest transit station.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

A triumphant marble and bronze fountain depicting a 15th-century Hungarian king and his hunting party.

A Hungarian pharmacy museum with a box full of mummy powder.

A marvel of technology a century ago, this disused power station now offers a lovely glimpse into the industrial design of the past.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Museum dedicated to the terror regimes of Hungary.

A giant gorilla made of used car tires used to sit sentinel over a Helsinki college campus.

These 5,000-year-old cave paintings provide a glimpse into prehistoric Finnish life.