One of the now-less-hidden floral gems of the "Emerald Necklace."

These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

This historic national park is covered in the stunning ruins of red rock pueblos.

One of the largest-ever mental hospitals now sits abandoned, surrounded by 25,000 unmarked graves.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

Stroll the grounds built by murder, suicide, and dirty oil money at one of Hollywood's most filmed mansions.

Prehistoric animals decorate this popular outdoor park.

This legendary "evil" doll has been haunting the citizens of Key West for over 100 years.

More than five miles of underground passageways.

The only diamond mine in the world where you can keep what you find.

One of the ghostly stops along Route 66.

Moonbows over Kentucky.

One of the oldest living oak trees in the Southeast.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A collection of full-size movie monsters opened to the public.

An abandoned vacation home spent a decade taking on legends. It's now taking on water.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

The largest drain hole in the world.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

The eccentric mansion of one the most popular horror authors of modern times.

The longest living non-clonal organisms on Earth.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.