A double agent hid information for the Soviet Union beneath this bridge for more than 20 years.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

The only recreation of William Shakespeare's indoor playhouse.

At 207 feet, one of the world's longest continuous escalators.

Lines from a walking song are etched into a rock in Natural Bridge State Park.

Exact replica of the ancient monument, but much, much lighter.

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

This old-fashioned carhop restaurant gave the world the waffle cone.

A convincing little bit of ancient Egypt smack dab in Richmond, Virginia.

Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

The site of the climactic scene from the classic horror film is now a historic landmark.

The United States Capitol's former columns still stand.

Outsider art meets paleontology at this roadside reptile repository.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

An alternate history park where the Union Army loses the war... to dinosaurs.

A small poultry graveyard in the courtyard of a popular Key West watering hole.

A haunted hot springs hotel that went from healing retreat to asylum before it was restored.

This bizarre hotel on historic Route 66 has been plagued by rumors of paranormal activity.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

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

The Burnside Fountain and its questionable interpretation.