The city of Rockford, Illinois is symbolically protected by a quartet of fittingly stony sentinels.

This Turkish cave boasts some rather bizarre associations with the King of Mount Olympus.

The longest navigable underground river in the United States is home to countless blind and albino animals.

The monster at the center of the Darwin Center Spirit Collection.

Mysterious tombstones thought to be remnants of Atlantis.

The dream home of an iconoclastic renaissance man still stands as a monument to his domestically mundane vision.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

A six-story-tall golden pyramid, surrounded by a moat.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

A monument to the one-armed geologist who led the first documented expeditions through the Grand Canyon.