The Corinthian columns that towered over Abraham Lincoln’s inauguration stand proud.

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

The beautiful, fruit-covered facade hints at this building's former life.

Just a man taking his prehistoric pet for a stroll.

A precariously balanced rock perches on the edge of a cliff created tens of thousands of years ago by glacial erosion.

This abandoned prison castle has become an imposing gallery of graffiti art.

This hidden labyrinth offers walkers some brief peace of mind.

A men’s restroom became a sandwich shop.

The only rotating bar in New Orleans has been slowly spinning since 1949.

This small museum concentrates on the juicy history of orange production in Florida.

Frank Lloyd Wright built this suburban synagogue late in life, but it stands among his most iconic masterpieces.

Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

This forgotten building was one of the few Philadelphia-area breweries to survive Prohibition.

One of the oldest of its kind.

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

Gnarled canopies of pink and purple wildflowers arch over the trail to the summit.

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

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

Perhaps the most scandalous statue of America's first president.

Edison's cast-in-place concrete houses were a failure, but way ahead of their time.

The lecture hall where Alexander Graham Bell first demonstrated the long-distance phone call.

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.