A herd of 150 bison live on California's Santa Catalina Island and are at the heart of an ongoing debate between environmental protection and economic expansion.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

The ghost town that ended up on Ebay.

This dormant volcanic crater has been converted from a roiling pit of magma to a pleasant hiking spot.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

Where NASA's satellites and rovers phone home.

One of the ghostly stops along Route 66.

A massive volcanic plug is now a protected area that hosts a number of bird species.

The unbelievably opulent home built for an infamous newspaperman.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

This enormous World War II relic is one of the largest wooden structures in the world.

Oldest building in California still in use.

Megachurch turned Catholic church comprised of 10,000 glass panes.

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

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.