A hollow cement depiction of time's inexorable effect on the human body.

A haunting statue called "Eternal Silence" has quite the reputation among visitors with active imaginations.

An enormous park-like oasis, full of famous Chicagoans' graves.

A whimsical tower with a spiral staircase, inspired by the Space Age and the Möbius strip.

Wisconsin's most celebrated export gets the royal treatment on I-94.

Once a sewer culvert, this road tunnel now offers cyclists and pedestrians a subterranean stroll under the C&O Canal.

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

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.

The innocent intentions of this monument are somewhat lost in the sculpture's muscled imagery.

This taxidermy horse was a Civil War hero.

The 28,000-year-old specimen is remarkably intact.

A line of blue paint marks the route of the inaugural parade.

The U.S. Navy’s preposterously detailed mini battleship took 77,000 hours to complete.

Part of a WWII submarine is lurking outside the Washington Navy Yard parking lot.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

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

The first memorial dedicated solely to the Black troops who fought for the Union.

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

An overlooked memorial honoring the local Washington residents who died in World War I.

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

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

This forgotten boat elevator was an engineering marvel in its heyday.

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

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