A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A surrealist labyrinth and museum of contemporary sculptures.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

Croatia's towering concrete blossom grows from the site of a World War II concentration camp.

This huge metal monument is slowly being stripped to its concrete skeleton.

Abandoned waterpark turned counter-culture mecca.

The site of a tragic massacre that spawned a multimedia franchise.

One of the oldest train stations still standing in Virginia played a vital role during the Civil War.

This Virginia railway overpass is said to be haunted by a serial killer in a rabbit costume.

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

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

This historic electric train has operated with regularity since the early 1900s.

The haunting cadaver tomb of a famous French poet, playwright, and filmmaker.