The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

The overgrown ruins of a once thriving World War I-era copper mine.

The eerie ruins of an isolated abandoned town nicknamed "the Widowmaker" for its deadly gold mine.

An overgrown garden stands as a grim marker of an unrealized dream.

An eerie, decaying ghost town destined to fade into the forest.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

Strange beasts lurking in a garden are all that remain of a quirky, short-lived theme park.

These abandoned grain silos and tunnels are an urban exploration dream.

The old fire tower is one of the last of its kind in the United States.

This old abandoned sign flickers to announce a motel that isn't even there.

A crumbling mountain resort that looks like it was abandoned in an instant.

A forgotten Cold War relic hidden in the outskirts of a Wisconsin city.

This abandoned bridge to nowhere stands secluded in the woods of a Cleveland suburb.

This off-the-beaten-path abandoned town is a relic of Montana's silver mining boom.

A little-visited ghost town state park offers a glimpse into Montana’s "Silver Queen."

A mining town, now abandoned, was built in a canyon so narrow that the railroad ran right through the hotel lobby.

An architecturally-focused antique shop.

Superfans of The Shawshank Redemption can take a driving tour of most of the films real locations.

The spectacular collection of one of the world's best woodcarvers.

A county library in rural Ohio houses one of the finest mineral collections in the world.

Deep scars on the earth left by the Ice Age.

The largest clock face in the United States is twice the size of Big Ben and infinitely more ad-sponsored.

Pennsylvania's own Roswell-style UFO mystery.

This abandoned amusement park was built on a site with a dark history.