Man-made mineral caves house massive bat colony.

Mysterious craters may have been home to an ancient cult.

This abandoned secret city is a crumbling wonderland of Soviet ruins.

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

The traditional Polish croissant, folded 81 times into the shape of a horseshoe, is a legally protected cultural treat.

The silly symbol for an underground protest group is now scattered around the city.

Communism's topsy-turvy effect on Poland has been brought to life in this wacky tourist trap.

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

Iron Age runes and ruins hide in plain sight along this Portuguese beach.

One of the few places in Portugal where the Celtic ritual of wearing large wooden masks is still practiced.

This gaping hole in the middle of a remote mountain lake looks like a portal to another dimension.