A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

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

This massive store is home to an eccentric collection of vintage, retro, and peculiar goods.

A look into the Church of Scientology's deeply unfavorable view of psychiatry.

A historic neighborhood church is reborn as a psychedelic arts collective.

These eerie outliers of the lightning bug family glow a mysterious blue color.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

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

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Towering basalt columns, a creation of fire and ice.

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

A modernist landscape of water and sci-fi concrete.

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

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

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

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

A restaurant on Staten Island showcases a different grandmother’s cooking every night.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

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

A strange house built only at night, with rumored mystic inspiration.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.