This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

Washington's iconic carousel has a nice piece of Civil Rights history.

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.

A historic ruin just 20 feet away from a busy highway onramp.

The "lovely red Vega" of the legendary record-settling pilot.

A painfully obvious spy house sits right across the street from the Russian Embassy.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

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

An indoor miniature village and labor of love for Laurence Geiringer, a model railroad enthusiast.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

A local prank turned town icon.

Some islands... they come, they go, especially on Lake Travis.

Turning night into day in Victorian-era Austin to thwart a serial killer.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

World War II bunker still standing on the New Jersey beach.

A failed piece of Orientalism has become the proud symbol of a community.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

This might just be the TARDIS of bookstores.

The highest point in Delaware is located under a trailer so this marker across the street will have to do.

Yo, Adrian!

The fastest transatlantic ocean liner sat abandoned in a Philadelphia shipyard for decades.