This memorial honors those who served on Gallops Island Radio Training Station during the second World War.

These whimsical works of art tell the story of the city's past and present.

Ice cream stand, snack bar, and time capsule of milk conveyance.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

The history of the tea trade is told in bas-relief on this historic pair of Boston doors.

Museum dedicated to awful artwork.

The often-overlooked ruins of one of the first buildings designed by famous landscape architect Frederick Olmsted.

The Boston square dedicated to the dark poet who was born nearby.

An enormous, inside-out glass globe built in 1935.

The tomb of Increase Mather and his son Cotton, influential colonial ministers obsessed with the occult.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

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

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

A clone of a cloned tree that was so important it allegedly had its own guards.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

Seemingly unremarkable items like empty sushi trays, chef hats, and freshness stickers are being preserved so future generations can look back on this beloved cultural import.

The house where John Wilkes Booth conspired with his co-conspirators.

A Spiritualist house of worship where believers communicate with the dead in the spirit world.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

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.

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.