An urban forest overtakes what was the greatest failure of utopic urban housing.

The oldest bar in Missouri is hidden within a limestone brewery cellar more than 50 feet underground.

Less a museum than a bizarre fantasy world created by artists and engineers.

A chessmaster's dream destination.

The man who was president for only one day and spent most of it asleep.

This wooded grove of beautiful hand-built stone grottos is a hidden gem within a shuttered Franciscan monastery.

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

If there's another drive-through golf-cart bar in a bat-filled cave on top of a mountain, we don't know about it.

The two-cell building in Nebraska was briefly owned by a teenage boy and then a Hollywood dummy.

Over 600 vacuum cleaners stack the shelves of what may be the cleanest museum in America.

The largest self-built castle in the U.S., six decades in the making.

A modernist landscape of water and sci-fi concrete.

Hollowed out cedar log tubs set in an ancient towering forest.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

Odd outsider art installations surround a Gold Rush-era ghost town.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

The rocks in this arid basin leave trails of movement behind them.

A beautiful geyser under environmental threat.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Venue for strange sideshow displays and musical acts.

Mysterious rocks that ring musically when struck.

This New Orleans tree is filled with hidden chimes that produce a carefully tuned melody.