Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

A bit of retro transportation flair preserved in the world's largest department store.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

Near-constant high winds deform the trees on Spruce Knob, the highest point in West Virginia.

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

One man's attempt to create an artistic wonder on a run-down block in Detroit.

A Beaux-Arts triumph rises from decades of decay to become the heart of a new innovation district.

The only surviving prototype for Buckminster Fuller's house of the future.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

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

Pennsylvania's highest point is spotted with boulders which were pushed to the surface by nothing but cold.

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

The largest clock face in the United States is twice the size of Big Ben and infinitely more ad-sponsored.

Frank Lloyd Wright’s most iconic home dangles over a Pennsylvania waterfall.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

Art deco landmark on the outskirts of Washington, D.C.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

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

Giftshop catering to cryptozoologists and anyone with a sense of humor.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

Home to items never before seen by the public.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

This grand gothic brewery has been pumping out suds for over a hundred years.