One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

A spectacular tribute to statesman and philanthropist Andrew Mellon.

An echo chamber with a waterfall wrapped around its base at the Embassy of Canada in Washington, D.C.

A much-maligned monument to teetotalism.

A derelict bit of transportation infrastructure hidden in the woods.

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

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

An 18th-century townhouse that once hosted guests of the president.

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

An unusual, super-sized grocery adventure awaits in an Ohio suburb.

An obsolete, vanishing traffic device warns Cincinnati drivers away from middle-of-the-road obstructions.

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

The massive, original Colgate Clock is mounted on a defunct factory building that was once a prison.

The Midwestern United States' tribute to Michelangelo is a foam statue sprayed with gaudy gold paint.

The oldest operating Mississippi River–style steamboat still navigates the Ohio River.

The farm where one of America's greatest leaders was raised is now a well-appointed landmark.

Man-made geyser that rises to the exact height of the Gateway Arch.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

A floating museum that was sunk by a flood and left to rot in the tides.

Hundreds of graffiti artists have decorated this flood-wall on the west bank of the Mississippi River.

This former small town was destroyed not by the motor oil it sprayed the ground with but by the toxic waste that was added.