Elevated freight railway turned wildly successful urban park.

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

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

Look closely and you’ll notice that the color changes a third of the way up the tower.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

Erosion and various mineral deposits give this striking canyon its distinct color and soft appearance.

A tunnel with windows, so you don't miss out on the impressive views.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

I-95's Tijuana-style celebration of kitsch at the Carolina border.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

Louisa May Alcott based “Little Women” on her experiences growing up in this house with her sisters.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

This small section of the Sleepy Hollow Cemetery is rotten with famous authors' graves.

A unique set of caves that spits waves back out into the ocean.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

A statue honoring 44 continuous years of greeting passing ships.

The first public building in Savannah to offer air conditioning was a luxurious cinema that still operates today.

"X" marks the spot of an echo chamber in the middle of a plaza.

Must form and function forever remain at odds? Not if the Florida Department of Transportation has its way.

Electrical pylon in the shape of Disney's beloved mouse.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.