One of the greatest maze designer’s greatest mazes.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

A museum of carnival attractions where you are invited to ride the rides.

Nearly 40 miles and 1,000 years of limestone mines under Denmark.

A submerged archeological park still holds the wonders of a Roman Sodom.

A museum dedicated to the Spanish occult in a town that was terrorized by the Inquisition.

Hidden deep in the Guatemalan jungle is a turquoise paradise of natural pools, caves, and waterfalls.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

Six beautiful wooden giants are hidden around Copenhagen.