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.

The hide of Stonewall Jackson's equine sidekick is on display not far from where the ashes of his bones are buried.

This monument is dedicated to those lost on June 6, 1944, in the town with that day’s highest per-capita casualty rate.

The story behind the mysterious symbol painted in front of the historic university's famous Rotunda.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

This site is home to ancient petroglyphs and pictographs dating back to 6,000 B.C.

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

A house carved into a rock in the 1940s.

The fifth-longest natural arch in the world, and the longest outside China.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

A monument to the one-armed geologist who led the first documented expeditions through the Grand Canyon.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

"Only the devil could play golf here."

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

One of the only known surviving coconut palm trees in the entire state.

Pay homage to a mysterious feline artifact outside of this Florida museum.

Wading through a small lagoon reveals a secret, wild stretch of pristine beach.

A building so large that it has its own weather.

A free public golf course hides in plain sight in the heart of Scotland’s capital.

The 20th-century chapel’s intricate woodwork includes amazing details, most notably angels playing bagpipes.

A series of waterfalls and pools that flow through the 'Ohe'o Gulch and into the ocean.

The king of U.S. high points towers over every other peak on the continent.

Buy your friend a drink or staple some cash to the wall for the next guy at the Salty Dawg Saloon.