This prison-turned-museum is a remnant of the Old West's grizzly, violent past.

This UFO landing strip was created by a charitable Wyoming city that was worried about residents of Jupiter.

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

A century-old cabin off of Highway 30 touts an unusual construction material: dinosaur bones.

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

A miraculous natural phenomenon known as "the spring that breathes."

An architect's childhood fantasy treehouse made real.

One man's ambition created this psychedelic log home.

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

The last remnants of Fort Pitt also hold the distinction of being the oldest structure west of the Allegheny Mountains.

This plaque marks a place where one of Hollywood’s most famous dancers got his start.

A private residence adorned with a gorgeous mural dedicated to the buzzing insect.

The souvenir got the company’s founder out of a pretty pickle at the World’s Fair.

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

A giant ball made from pieces of an old Jeep.

This picturesque stream was up until recently the site of a ten story mountain of slag and sewage.

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

These medicine cabinet staples are part of the museum's collection of everyday objects.

A museum commemorating the Donora Smog, which killed 20 people in October 1948 and sparked national outrage over air pollution.

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

A portion of the old Pirates stadium over which a defining home run once flew still stands even after the rest of the stadium was torn down.

The residents of this ominous-sounding street in Pennsylvania liked its name so much they fought to keep it.

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

An Irish Memorial commemorating those who perished due to potato blight.