The secret city built by the Manhattan Project.

This former mill tunnel was blasted under the ridge to divert a portion of the Muscatatuck River.

An old railroad crossing that’s been converted into a pedestrian bridge.

The massive, original Colgate Clock is mounted on a defunct factory building that was once a prison.

The site of the largest mass execution in Rhode Island history, haunted by the ghosts of hanged pirates.

Inside the simple black-and-white exterior of Église Sainte-Cécile hides a pastel wonderland.

Everyone's invited to put on a miniature concert with this world-class musical wonder.

This is the last hand-cranked chain ferry of its kind in operation in the United States.

Winter weather reveals a large Italian marble crucifix drowned beneath Lake Michigan.

Hidden on a cattle ranch in Arizona, this bookstore has been celebrating Southwest literature for more than 40 years.

This open-pit mine is now an abandoned symbol of Bisbee's copper-mining heritage.

Stairs often replace streets on the steep slopes of this old mining town.

The world's largest military aircraft cemetery.

An Arizona museum with a collection of pharmaceutical oddities, including a jar of a gangster's chewed gum.

In Tucson a giant metal snake helps pedestrians cross a busy highway.

Sleep where gangsters fell amidst smoke and flame, with nary a bullethole to show for the legendary struggle.

The first steel dam in the world and the only one still functional in the United States.

The final resting place of the businessman-turned-astronomer who helped discover Pluto stands near his observatory.

This historic national park is covered in the stunning ruins of red rock pueblos.

One of the final grand railway depot hotel complexes is slowly being restored to its former glory.

The remains of this hell for leather wild west town can still be found in the Arizona desert.

This mysterious Lady Liberty stands at the entrance to a small Israeli village.

A neighborhood of houses made of poured concrete through a process invented by Thomas Edison.

A humble plaque marks the site where the country music legend was found dead in his Cadillac.