An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

Outsider art meets paleontology at this roadside reptile repository.

Bizarre Cavern.

Fascinating museum dedicated to the under-appreciated medical history of urology features some wince-inducing devices.

Remnants of a storybook amusement park hidden behind a strip mall.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Home to items never before seen by the public.

A priceless collection of the Nation's cryptologic history.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.