Sloth rehabilitation center in the jungle of Costa Rica.

A waterfall and cave near Arroyo Seco that inspired the writings of D. H. Lawrence, Willa Cather, and Mabel Dodge Luhan.

These unique volcanic rock formations offer the perfect opportunity to camp and hike.

The ruins of this former mining boomtown once housed over 3,000 people. Now, the population is two.

Inside this small museum resides a strange mix of miniature collections passed down over time.

A little slice of Florida face-in-a-hole kitsch, unexpectedly located in a small New Mexico town.

A warm desert spring holds one of the rarest species on earth.

On the edge of the Valles Caldera National Preserve, these rock formations create an eerie landscape.

The 7,000-year-old calcium carbonate formation creates a magnificent natural bridge.

Thousands of mounted insects, and some live ones, hide within an otherwise ordinary shopping mall.

Reproductions of nine banned oil paintings coyly hidden behind a curtain in a New Mexico conference room.

At this research institute, the chile is king.

This museum started as a collection of Manhattan Projects and continues to add exhibits as they are declassified.

A museum devoted entirely to the rattlesnakes and snake-related art.

A unique geological area spiked with wind-carved rocks that resemble teepees.

Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.

These aggressively sustainable art homes look like something out of 1970's science fiction.

This "common-as-dirt" museum celebrates the glory of normalcy.

The "original web site," this farm in Northern Vermont encourages orb-weaver spiders to build their daily webs, and then sells the preserved masterpieces.

This 38-drawer structure claims the superlative title, but it isn't the world's only giant filing cabinet.

This cavernous abandoned marble mine is popular with ice skaters in the winter.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

An enormous cat made of recycled wood scraps.

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