This quarter-mile tunnel under the Bluff in Pittsburgh bends at a 45-degree angle.

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

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.

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

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

A daily replay of the experiment that proved the rotation of the Earth.

This beloved marketplace mascot poops money and grants good luck.

This elaborate towering structure was once famed for its revolutionary height.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

Yo, Adrian!

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

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

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

Wayne Newton's sprawling estate is now open for visitors to catch a glimpse of his "heart and soul."

A volcanic spur of Lake Tahoe wrapped in Washoe sacred stories and road tunnels

The museum is housed inside the historic 1863 Carson City Mint.

Named after an outlaw who used the basin as a hideout.

The arch that celebrated the completion of the Lincoln and Victory highways.

A memorial to the unknown and unheralded men and women of the Cold War military and intelligence services.

An old railroad grade built for the construction of Hoover Dam is now a recreational trail featuring several tunnels and sweeping views of Lake Mead.

A professional special effects makeup artist’s collection of horror creatures and one-of-a-kind recreations on display in downtown Boulder City.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

This mostly abandoned shopping outlet is now adorned with beautiful graffiti and murals.