Sacred Buddhist home of some spiritual monkeys.

The fairy tale castle of the "fairy-tale king."

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

A World War II torpedo launch station abandoned off the Polish coast.

Crosses of all shapes, sizes and colors litter the mountain, the site of a huge yearly Orthodox pilgrimage.

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

The site of the first battle of World War II.

Countless stories attempt to explain Poland's mysterious J-shaped trees.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

The unsettling remnants of a torn down movie set lies nearby the ruined location of the actual Płaszów Labor Camp.

Cat art as far as the eye can see.

The world's only museum devoted to the wonders of fluorescence.

This tower once served as a radar station during the Cold War.

A devasting 2020 fire left this historic seminary in ruins.

This star-shaped military outpost is now simply trying to protect itself from neglect.

Catering to broken dolls for almost 200 years, this repair shop is now a charnel house of doll parts.

This abandoned five-star hotel is now a five-star urban exploration destination.

An abandoned mine now resembles a post-apocalyptic landscape of derelict buildings and blood-red pools of water.

An early work of the architect Álvaro Siza Vieira, these swimming pools blend into the beach.

An early Portuguese serial killer's head is alarmingly well preserved in a jar at the University of Lisbon.

A submerged village appears when dam levels drop.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

The largest collection of death masks in Ukraine.

Like something out of a bad acid trip, this Ukraine hallway has been covered in hallucinatory phantasmagoria.