The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

A grave surprise in the downtown area of New England's second-largest city.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

Located just behind a quiet residential neighborhood, this is ground zero for the Salem witchcraft hysteria of 1692.

Memorial of the Salem witchcraft hysteria in the town of Danvers, where it all began.

A simple but powerful tribute to the 20 victims of the 1692 witch trials.

This historic graveyard monument is dedicated to a tragic victim of witch trial hysteria.

The second oldest Jewish graveyard in the U.S. is tiny, with connections to George Washington and Henry Wadsworth Longfellow.

The site of the largest mass execution in Rhode Island history, haunted by the ghosts of hanged pirates.

This stately mansion, built in 1787 by America's first Secretary of the Navy, is rumored to be one of the most haunted buildings in Washington, DC.

Amid the sprawling Defense Intelligence Agency Headquarters is one of Washington's least accessible museums.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

There's an old indoor swimming pool hidden directly underneath the White House Press Briefing Room.

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

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

A painfully obvious spy house sits right across the street from the Russian Embassy.

This opulent hotel has been visited by Spider-Man, Charlie's Angels, and the Ghostbusters.

Superfans of The Shawshank Redemption can take a driving tour of most of the films real locations.

A historic presidential getaway on the continental United States' southernmost island.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

The scarce remains of a sunken ship peek out from the sand on East Beach.

Plymouth's huge yet little-known memorial to the Pilgrims.