A clear blue swimming hole with hidden caves, still unexplored.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

Eons old volcanic activity created one of the most stunning rock formations in the United States.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

All that's left of the quintessential "cabin in the woods."

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

This woodland architectural installation acts as a camera obscura for the heavens.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A lush green oasis in the middle of Chicago.

A reproduction of earth's many biomes.

One part antique store, one part curiosities hodge-podge.

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

Canyon walls shrouded in ferns.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

A Bibliophile's Dream.

A house filled to the brim with oddities and curiosities.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

This grand gothic brewery has been pumping out suds for over a hundred years.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."