This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

Colorful murals stationed throughout Charlotte bring poetry to everyone.

A psychological self-portrait in the form of a giant, segmented head.

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

This church built atop a gas station promises to "equip you for the next stage in your life’s journey."

These unusual rooms on wheels are holdovers from the 1960s.

Long buried under the 20th-century landscape, this lift lock of the Alexandria Canal is the lone remnant of an ambitious early American transportation project.

The former home of the man whose radical ideas changed the nation.

A former major munitions plant that has been converted into a sprawling art space.

This sprawling farm was once a Cold War-era hideaway for the nation's top diplomats.

The tomb was guarded by soldiers from both sides of the war, and some left their initials carved in the brick.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

America's first federal monument.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

The narrowest house in America is seven feet of pure spite.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

This spot memorializes one of the greatest plays in NFL history, unless you happen to be a Raiders fan.

A portion of the old Pirates stadium over which a defining home run once flew still stands even after the rest of the stadium was torn down.

Hundreds of protractors affixed to surfaces all over the city.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

There aren't too many operational funiculars around, but Pittsburgh has two!

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

This restaurant offers a side of antiques, curios, and a bathroom chock full of owls.