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

A historic neighborhood church is reborn as a psychedelic arts collective.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

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

A wondrous old library overlooking the nation's capital.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

The United States Capitol's former columns still stand.

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

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

This grand gothic brewery has been pumping out suds for over a hundred years.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

Ship skeletons haunt Baltimore's waterways.

The likeness of the Baltimore music icon was unveiled in time for the anniversary of his Senate hearings on music censorship.

One of the oldest anatomical theaters in the U.S. still in use was once the site of an infamous cadaver riot.

A model home in the Medical Examiner's Office in which grisly death scenes are staged to train forensic investigators.

George Washington's dentures and Queen Victoria's dental instruments are in the nation’s official museum of the dental profession.

This simple convenience store sits on the location where the Ouija board was named—and has a plaque to prove it.

Walk through the history of American pop culture.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

Eighteen miniature death-scene dioramas.