The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

This replica of the Greek structure is in the heart of Nashville.

A 56-foot tall statue of the god of fire looks out over Birmingham, Alabama.

Once one of the largest producers of pig iron in the world.

Every last book in this bookstore is signed by the author.

FDR hoped to find a cure for polio in this Georgia town's warm springs.

If all members were present at the table, a sixth of the world's wealth would be under the same roof.

The remnants of the fortress that saved Georgia from the Spanish still stand guard on their swampy island.

Auburn's iconic eagle flight goes back to a 19th century eagle that dropped dead on the field after inspiring the football team to victory.

The record holder for the world’s largest peach.

This massive store is home to an eccentric collection of vintage, retro, and peculiar goods.

The largest puppetry museum in the United States houses the world's most complete collection of Jim Henson artifacts.

Civil War soldiers, captains of industry, and paupers all interred on historic grounds.

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

The final resting place of New Orleans' most famous voodoo priestess.

The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

This forgotten boat elevator was an engineering marvel in its heyday.