Ancient pueblos built into the base of a natural canyon wall.

More than 25 fully functional scale replicas of famous lighthouses dot the shores of Lake Havasu.

In 1975, a forestry worker in Arizona claimed to have been abducted by a UFO.

In one of the hottest parts of the Mojave Desert, shallow bedrock forces the typically dry Mojave River to the surface in this canyon, providing a vital oasis for humans and wildlife.

No one’s quite sure why there's a metal megaphone bolted on two rocks in the middle of the Mojave Desert.

This giant temperature attraction created some giant electric bills.

An off-grid art installation that encourages its visitors to imagine a world without waste.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

A hand-built folk art installation covered with messages of God's love.

A wondrous place to watch a special flower bloom.

Two tall rocks sit at the center of this site, once the home of a large Ancestral Puebloan community.

Possibly the world's only drive-in movie theater with an attached motel.

One of the most unusual geological features, recognizable from a dozen hit movies.

A rugged lava field dotted with molds of the ancient pines that were growing when the volcano erupted.

Atop an active stratovolcano, two lakes separated by a narrow strip of land.

Canyon walls shrouded in ferns.

This historic steamboat is scuttled just a few hundred feet from where it was built over a hundred years ago.

According to legend, this rock represents a young girl trapped by an evil ocean spirit.

The park preserves a single, rare species of carnivorous plant that spells doom for unsuspecting insects.

On the Oregon coast is a natural hole that seems to be draining the sea.

This former small town was destroyed not by the motor oil it sprayed the ground with but by the toxic waste that was added.

A floating museum that was sunk by a flood and left to rot in the tides.

This Arkansas town is known for its gangster history, its healing waters, and now its brews.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."