Roman ruins top white travertine terraces formed by ancient hot springs.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

This Minsk museum has cat coffee, cat chess, cat art, and even a cat "staff," which visitors are free to take home.

A marker honors the brief peace found by a tormented artist in the fictional land of Kcymaerxthaere.

These 18th-century paintings of Warsaw were used to reconstruct the city after World War II.

This hilltop ruin is of the hundreds of stone columns built in tribute to the first German chancellor.

Dubbed "Wistom" by locals, this abandoned factory is an urban explorer's dream.

An abandoned football stadium with a tragic past.

An abandoned Jewish sanatorium is tucked within the woods of Poland.

A collection of old neon signs from all over Poland line a secluded courtyard.

This hidden collection of everyday objects illustrates life within communist Poland.

A haunting deserted hotel is a favorite with artists and photographers.

This fairytale inspired, warped building houses restaurants, shops, and a radio station.

A mysterious structure left behind on the Polish mountainside, sometimes called "Hitler's Stonehenge".

A peculiar family mausoleum built by a German nobleman captivated by the occult.

An abandoned Nazi explosives plant founded by the inventor of dynamite is now an underground museum.

The world’s narrowest house makes for an awkward, four-foot-wide living space.

This 700-year-old structure is one of the most unique architectural and historic monuments in Gdańsk.

Warsaw's fantastically preserved gasworks...almost.

A hidden art gallery in an abandoned Warsaw fort.

This uber-quaint Polish village is known for its habit of painting elaborate floral motifs on just about everything.

The site of the first battle of World War II.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.