An architect's childhood fantasy treehouse made real.

A home covered with elaborate mosaic and other pieces of art.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

The scant remains of an expansive indigenous civilization can be seen at this Arkansas state park.

This century-old roadside attraction is full of bizarre rock formations.

This haunted hotel built on natural springs once served as a hospital for a quack doctor promising a cure for cancer.

A mysterious light floating in the trees of Arkansas may be a piezoelectric effect.

This quirky Arkansas wax museum does not shy away from the macabre and the grotesque.

Everything in this miniature world was handmade from matches, paperclips, wires, tin cans, and other everyday objects.

An ever-growing collection of rare and strange objects owned by local Arkansas illusionist Maxwell Blade.

This small Arkansas town once had a close encounter with the Beatles, and are determined never to let anyone forget that. Ever.

Twenty-year effort to raise a castle using tools and techniques from the 13th century is now abandoned in the Arkansas woods.

A hillbilly theme park that proved so unpopular the land wouldn't even sell on eBay after it closed.

An abandoned early-20th-century boomtown sits within the Calico Rock city limits.

A wild trout fishery in Arkansas.

This one-room schoolhouse in rural Arkansas dates to the 1920s, but looks like it could be the 1820s.

A whimsical tower with a spiral staircase, inspired by the Space Age and the Möbius strip.

To honor his gardening wife, this yard artist turns bowling balls into playful, colorful sculptures.

This ostentatious Italianate palace of an Oklahoma billionaire is filled with several themed mini-museums.

A unique set of caves that spits waves back out into the ocean.