The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

A diorama of the Civil War, fought by cats.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

Alexander Hamilton’s creation caused quite a bit of controversy.

Yo, Adrian!

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

The world’s first penitentiary, meant to be humane, drove men insane.

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.

The most decorated dog of World War I is preserved in the Smithsonian.

There’s a hidden military meme engraved on the World War II Memorial.

The only surviving fragment of the lost Narragansett Pier Casino.

This lighthouse was witness to the end of WWII hostilities and now collects creepy cairns.

Mysterious stone tower featured in many alternative histories of the New World.

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

These headstones and a few stone foundations are all that remain of a once-booming mining town.

The unusual patterns in this rock formation result from two distinct modes of weathering.

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

Local lore holds that Butch Cassidy took an escape route through Red Canyon's sandstone hoodoos after an attempted murder.

Settled by the Church of Jesus Christ of Latter-day Saints in 1859, this abandoned frontier town has appeared in several films.

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

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.