Double spiral staircases are not unheard of, but they are very rare.

The world's only three-story rotary jail is now a museum to a bizarre trend in prison design.

This intricate Hindu temple is the largest of its kind outside of India itself and was constructed like a giant puzzle.

Tour the sci-fi-esque reality of governmental disease management.

Just a few miles from downtown Atlanta is a trail covered in a crazy collection of outsider art.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

Approximately 250,000 people left homeless by the great earthquake and fires found shelter in Golden Gate Park.

An institution that preserves the history of institutionalization.

America's largest man-made forest was planted in an effort to bring back the past.

One of the world's most definitive collections of musical instruments, spanning all cultures and historical periods.

Known as "The Hill of the Little Devils."

America's smallest town is run by its single citizen/mayor/librarian/bartender.

America's silhouette includes 100 square miles of wilderness jutting into Canada thanks to an old mapmaking error.

The ravine where Jesse James supposedly performed an impossible jump to evade capture.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

A place where the laws of nature seem to have gone completely berserk... but of course haven't.

Mysterious concrete spires left on a small Canadian hill.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

This notorious Canadian mental institution was home to some of the first LSD experiments and origin of the word "psychedelic."

The oldest badlands in North America, Makoshika State Park takes it name from the Lakota words for broken land.

Only place outside China and India where two overhead DC power lines cross.