A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

Leaf through over 30,000 artists' sketchbooks in what may be the world's largest collection of doodles

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

Priceless space junk on display in front of a local Dairy Queen.

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

Despite being stolen multiple times, this civic electrician's street corner Snoopy won't be stopped.

Huge masonic hall in Philadelphia with lavishly themed rooms.

An abandoned stretch of highway, deteriorating next to the operational one.

Mysterious rocks that ring musically when struck.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

Take a steam-powered ride straight out of the past on this Appalachian rail line.

This abandoned dream castle and its cemetery look out over the city that once inspired their creation.

America's post-nuclear-attack chambers of Congress.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.