One of the three perfect vellum copies of this historic book known to exist is on display in a specially-designed case.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

The only Leonardo Da Vinci painting in the Western Hemisphere.

You can find America's highest suspension footbridge at Grandfather Mountain in North Carolina.

Scenic mount trashmore, Virginia Beach's most curious waterfront still has a couple of secrets.

The only surviving prototype for Buckminster Fuller's house of the future.

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

Classy up your Big Mac with bow-tied servers and chandeliers at the world's fanciest McDonald's.

Look closely and you’ll notice that the color changes a third of the way up the tower.

A serene temple with stunning stained glass hides in downtown Dallas.

This downtown Dallas art installation is always on the lookout.

At one of the nation’s longest-running professional theaters, the audience used to barter for tickets with produce and livestock.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

A delightful park featuring homemade scale replicas of dinosaurs, tucked away in the Tennessee mountains.