The rooster who crossed the road lives on forever in Takoma Park, Maryland.

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.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

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

The heroic sled dog of the 1925 serum run is preserved in taxidermy.

‘Bush the old fire dog died of poison July 5th, 1869. RIP.’

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

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

They sort through millions of dollars worth of diplomatic gifts on behalf of the government.

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

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

100 years later, they're still down there.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

In the basement of the U.S. Capitol Building is a hidden storage room full of ornate floor tiles leftover from the 1850s.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

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

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

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

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

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

The most decorated dog of World War I is preserved in the Smithsonian.