A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

One of only two commuter aerial tramways in the United States.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Read a book next to a Midtown waterfall.

Elevated freight railway turned wildly successful urban park.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

A crumbling hospital from the 1850s on Roosevelt Island.

This centerpiece of the Hollywood & Highland shopping center is a recreation of a long-lost movie set.

The decor of this Hollywood movie palace just barely predated the opening of King Tut's tomb.

What appears to be a wizard's lair in Milwaukee actually houses a massive water pipe.

A giant, Gilded Age mansion that once belonged to the beer baron of Milwaukee.

Six tiny houses built for working class people form the largest intentional cluster of Wright homes anywhere.

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

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The peaceful space is adorned by paintings by the famed abstract artist Mark Rothko.

This replica of the Greek structure is in the heart of Nashville.

Art Deco urban decay at this historical building.

This towering volcanic plug stands out among the dramatic formations that dot this otherworldly desert valley.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Memorial built in 1922 in remembrance of WWI casualties.