The show pony of cave systems, Fantastic Caverns manages to live up to its name.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

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

European castle ruins in an American state park are actually the product of death and grief.

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 history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

This 22-acre botanical garden is home to the largest collection of rhododendrons in the world.

In this century-old literary safehouse, print is alive and well.

A museum befitting the city responsible for supplying the majority of the world's LSD.

This monument to the victims of a tragic explosion is said to turn and look at passing cars.

A preserved stretch of ancient fossilized trees with an impressive gem collection to boot.

One of the longest water bridges in the world was built over a supposedly haunted swamp in Louisiana.

The world-record holder for the longest bridge stretching continuously over water.

A symbol of Texas pride.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

A National Historic Landmark with a scenic clock tower and park filled with deer and peacocks, plus a military museum.

A 131-year-old wunderkammer of Texas history.

A gorgeous garden oasis with winding paths, stone bridges, and a troubling history.

A popular swimming hole that hides one of America's most deadly diving spots.

A vaudeville performer mounted this hollowed-out redwood log onto the chassis of a truck, and toured the country spreading a message of conservation.

The monument dedicated to Phineas Gage in the town where his accident happened.

The first evidence of some of the Earth's earliest life was found in this fossilized undersea grotto.

Surprisingly aquamarine waters fill deep lakes formed at the end of the last ice age.

This sandstone gorge in New York State's Adirondack Mountains is home to waterfalls, flumes, and more.