Toss a Frisbee through the ruins of this Colorado gold mining town.

This massive home was constructed by one of the greatest conservationists in Colorado history.

A downtown park built on top of unclaimed graves.

The ruins of this abandoned fort now stand as a picturesque reminder of America's march West.

A clear blue swimming hole with hidden caves, still unexplored.

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

One of the most extensive and well-preserved collections of dinosaur footprints in North America.

With well over 130 falls and cascades to brag about, Hamilton, Ontario has earned its stripes as the waterfall capital of the world.

One of the largest underground systems runs under Canada's largest urban center.

The largest self-built castle in the U.S., six decades in the making.

This naturally-sourced hot spring is now home to a clothing-optional resort.

This massive redwood tree has a hole in the base big enough to drive through.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

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

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Erosion and various mineral deposits give this striking canyon its distinct color and soft appearance.

Jurassic Park—A Still Life.

The fifth-longest natural arch in the world, and the longest outside China.

A house carved into a rock in the 1940s.

This giant temperature attraction created some giant electric bills.

Finally the worlds of UFO enthusiasts and beef jerky lovers have come together in this roadside shop.

This former shopping outlet is now adorned with beautiful graffiti and murals.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.

A sprawling cave network created by a lone lava tube.