Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

A 18th century graveyard and its astonishing cortege of macabre iconography.

The final resting place of soldiers' loyal canine companions.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

A 56-foot tall statue of the god of fire looks out over Birmingham, Alabama.

The world's longest known cave system.

Prehistoric animals decorate this popular outdoor park.

This replica of the Greek structure is in the heart of Nashville.