This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

San Francisco's newly reopened hands-on science museum.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

This museum started as a collection of Manhattan Projects and continues to add exhibits as they are declassified.

This popular pilgrimage site offers a hole filled with holy healing dirt.

A multi-storied adobe complex has been inhabited for more than a thousand years.

Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.

A small granite block at this monument's base is the only part of Lincoln's Tomb outside of Illinois.

An Olympic hero stripped of his medals is buried in a town he never visited, which took his name after his death.

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

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

Steepest flood safety railway in the entire world.

This jail which was in service for over a century is now open for curious visitors.

A local prank turned town icon.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

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

This Tennessee museum is dedicated to a tragic railroad hero who inspired the famous ballad that bears his name.

One Confederate statue that accurately reflects the ugliness of its subject.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.