This secluded ruin was once a home for exotic plants.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

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

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

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

A reproduction of earth's many biomes.

See massive fossils that are over 200 million years old in northeastern Arizona.

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

The last of its kind in the country.

A 1950s Googie burger stand is now a Los Angeles landmark.

The headquarters of the semiconductor giant has a 10,000-square-foot museum.

The White House Situation Room was taken apart in 2006 and shipped to the Ronald Reagan Presidential Library.

The final resting place of one of Hollywood’s most prolific and talented actors is on the grounds of a California Mission.

Sports history, made in the Arroyo Seco.

"The Star Factory" cranked out Hollywood stars like nobody's business.

The exterior of this home was used for the hit television show, The Brady Bunch.

The mall's looks were inspired by the cowboy extras who used to meet up—and cause real trouble—at this Hollywood hub.

One of Hollywood’s favorite government buildings.

A few iconic structures are all that remain of America’s first outdoor shopping mall.

Hiding amid the largest camellia collection in the country lies a charming children's maze, donated by a secret admirer.

An Italian restaurant became a rock-and-roll hangout and the lair of the "Hollywood vampires."

A massive volcanic plug is now a protected area that hosts a number of bird species.