Neither Spanish settlers nor anyone since has been able to tell who built these strange California rock walls.

Giant pinnacles in the sun-scorched lands of Southern Utah have been nicknamed "white ghosts."

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

An extensive collection of ancient Egyptian artifacts and mummies.

Robots, lasers, and whoopee cushions, oh my!

Chicago's largest cemetery is full of beautiful Victorian monuments and more than a few ghost stories.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

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

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

A museum within a museum, devoted to history's most questionable medical devices.

Prehistoric animals decorate this popular outdoor park.

A 120-year-old legend concerning an empty circular patch in the North Carolina woods.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The highest bridge in America was built for an almost unnervingly small amount of money.

Half of a waterfall goes into the river while the other half seems to disappear.

A 200-year-old building in the French Quarter that was to be Napoleon's home in the New World.

The longest navigable underground river in the United States is home to countless blind and albino animals.

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

A collection of Witchcraft artifacts and occult paraphernalia started by the leader of the Long Island Coven.

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.

America's only nuclear missile silo open to the public.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

The restaurant keeps a hidden séance room on the second floor and reserves a table for the spirit of the former owner each night.