An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

The oldest inn in England served brew to the crusaders.

The alleged birthplace of Lady Jane Grey, who was executed at age 16 for claiming the throne of England.

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

If astronomy had a ghost, it would look like this observatory.

Ornate limestone building now filled with geologic specimens, and more.

The world's largest anatomically accurate brain sculpture.

The world's largest collection of mechanical puzzles is a cornucopia of analog bafflers.

A lesser-known part of the Kinsey Institute is this impressive collection of art, artifacts, and material culture related to human sexuality.