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

Home of the only civilian casualty at the Battle of Gettysburg.

The antique hotel still has a jail in the basement, though the cockfighting ring is long gone.

Considered by many to be a local landmark and treasure.

This museum glorifies the humble potato.

The first declared National Monument in the United States.

Around half a million years ago, these magnificent columnar basalt cliffs were formed from cooling lava.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

An architect's childhood fantasy treehouse made real.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

The fifth-longest natural arch in the world, and the longest outside China.

A house carved into a rock in the 1940s.

This giant, rotating globe was built to celebrate the expansion of a company that makes steam cleaners and pressure washers.

A collection of bite-sized buildings creates a magical mini village in the Pennsylvania mountains.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

An American flag was erected for every day that passed during the Iranian Hostage Crisis.

A diorama of the Civil War, fought by cats.