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

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

A reproduction of earth's many biomes.

A clear blue swimming hole with hidden caves, still unexplored.

A museum dedicated to the alleged Roswell Incident.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

One of only two commuter aerial tramways in the United States.

A modernist landscape of water and sci-fi concrete.

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

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Ride the subways of yesteryear.

Two thousand artifacts from around the world collected by one woman who loved to travel.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

A layered tribute to the work of mosaicist Isaiah Zagar.

Four hundred granite steps were built into this massive rock by the National Park Service.

Oldest building in California still in use.

One of the largest helium balloons in the U.S. is a 112-foot ginormous orange.

This enormous World War II relic is one of the largest wooden structures in the world.

A small sculpture garden that provides a microcosmic representation of California.

Church and home-museum of a 1920s female revivalist preacher with a very sordid past.

A UFO scrapyard in the California desert.