The ancient Greek Titan guards this massive dam holding a lightning bolt to symbolize electricity.

This Italian foot path winds through the mountains via 52 individual tunnels.

This recently restored crypt was once plagued by liquefying coffins and exploding caskets.

This snug medieval lane is one of the narrowest streets in the world.

This ancient tunnel is one of the most important examples of Roman hydraulic engineering in Spain.

This fascinating abbey is considered the oldest monastery in the region.

This mesmerizing medieval monastery-cave complex sits thousands of feet above ground overlooking a valley.

Inspired by a dream, a hermit carved out a home in this sandstone bank to live a life of contemplation and prayer.

Crossing a suspension bridge above a forest is the only way to reach this 12th-century monastery.

On the outskirts of the small village, an abandoned grassy field glitters thanks to the white stones of an ancient structure.

A spooky spot along the road where things mysteriously seem to move uphill by themselves.

This enormous abandoned prison was once dubbed the "Bastille of Romania."

Even drowned in an ocean of toxic waste, the remnants of this Romanian village stand tall.

This makeshift concrete bunker is an unusual reminder of the Cold War.

A burial ground for workers at one of Hawai'i's largest sugarcane producers that laid buried for decades.

A peculiar museum that includes many drunken tales, a drunk driving simulator, and much more.

This former peat factory was transformed into an observatory before being abandoned once again.

A Spanish forest is filled with mysterious stone carvings.

A series of five defunct panopticon prisons in Cuba.

This hauntingly beautiful cemetery outside a medieval citadel is full of winding paths and ivy-covered graves.

The Natural History Museum that time forgot.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

This massive underground salt mine now holds a sci-fi theme park in its depths.

Home of the first female Hungarian poet, where her secret writing lay hidden for over a century.