A self-built castle made by a mysterious man.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Dramatic river bend surrounds a natural red-rocked pedestal.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Most-visited and most-photographed slot canyon in the American Southwest.

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

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

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

A brick-lined alley full of public artwork tucked away in downtown Gulfport.

A seven-ton black granite monument dedicated to the memory of those who died and those who lived through the 1977 crash of the popular Southern rock band.

A historic Civil War estate-turned-museum looks back on the Confederate States of America.

This monument to the victims of a tragic explosion is said to turn and look at passing cars.

This racially troublesome eatery thought a new coat of paint could erase its offensive connotations.

Built following the War of 1812, this fort has withstood hurricanes for centuries.

This two-room shotgun shack in Tupelo is the birthplace of a King.

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

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

One of America's first dinosaur parks gives a window into Depression-era paleontology.

Calidum et Deliciose Succosum!

The self-proclaimed gateway to the Extraterrestrial Highway.

This sign designates the road that leads to the infamous Area 51.

An overlooked monument to the celebrity gangster who helped put the sin in Sin City.

Mysterious meeting place for UFO hunters near Area 51.