These abandoned waterworks are crumbling into the Potomac River.

A building shaped like the Army Corps of Engineers logo, because why not?

The school tested mustard gas for the U.S. Army during World War I.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

Perhaps the most scandalous statue of America's first president.

When it comes to handsignals (and colonialism) rock always beats scissors.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

The most accurate timepiece in the world.

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

There’s a hidden military meme engraved on the World War II Memorial.

Home to items never before seen by the public.

A fantastic array of trays and cables once whisked books over to the Capitol at 600 feet per minute.

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

An obscure public service from the U.S. government that redeems burnt, moldy, and soiled old greenbacks.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

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

A Cajun-style Christmas on the river also involves sky-high pyres and explosives.

A museum of unusual collections, mini-towns, and a half-dog, half-alligator.

Look closely and you’ll notice that the color changes a third of the way up the tower.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

A nostalgic bibliographic gem.

Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.