This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

Politicians, bureaucrats, and military officers gathered in this field near the Capitol to settle their disputes with blood.

This poor little statue is the most vandalized memorial in Washington.

Home to a vast and influential collection of Shakespeareana.

People escaping slavery may have hidden inside a corpse vault.

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

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

The United States Capitol's former columns still stand.

An original apothecary from 1792.

A genuine Tudor manor transported piece by piece from England.

The childhood home of the Sultan of Swat is just a line drive away from Oriole Park at Camden Yards.

Once part of a dam servicing an early 19th century grist mill, the tucked-way falls are a tricky-to-find urban oasis.

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

An abandoned church gets a second life as a massive beer hall and event space.

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

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

The land is home to swimming ponies and a legendary 18th-century treasure.

An eerie, decaying ghost town destined to fade into the forest.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."