Take a drunken tour inside the world's largest known geode.

A scenic fort on the harbor protected Philadelphia from an attack that never came.

A wrecked ship dating back to the American Revolution was only recently discovered off the Delaware coast.

A historic cemetery with unique artwork, a Civil War fort, and also happens to be the site of the Battle of Bladensburg.

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones' Locker.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

Built by the patriotic residents of Boonsboro in a single day.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

A blank headstone topped with a pile of pennies marks the final resting place of the infamous assassin.

A priceless collection of the Nation's cryptologic history.

Bizarre Cavern.

Fiji mermaids, mummified remains, and recreated cryptids are among the morbid oddities at this Maryland museum.

This free, take-a-book shop seems like a trick but isn't.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

The building that inspired Shirley Jackson's "The Haunting of Hill House."

Cryptid lake monster honored with its own monument.

A tomb with a window to ensure the interred wasn't buried alive.

This "common-as-dirt" museum celebrates the glory of normalcy.

These mysterious petroglyphs in Vermont reflect a troubled history in the treatment of Native American culture.

The sweetest graveyard in the world is filled with headstones for dearly de-pinted ice cream flavors.