This ancient sinkhole-turned-healing-pool is a treasure trove of archeological discoveries and may even be the Fountain of Youth.

A historic covered bridge, only one of two remaining in North Carolina.

Abandoned silver mine strewn with wrecked and twisted structures.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

This bright yellow relic is the final survivor of a short burst of seashell-shaped petrol pumps.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

A piece of outsider public art accompanied by a strange urban legend.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

148 feet long and in the middle of a verdant forest.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

Half of a waterfall goes into the river while the other half seems to disappear.

They call this long foot bridge a swinging bridge, but really it's the bouncing you have to watch out for.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

One of the oldest living oak trees in the Southeast.

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

The only diamond mine in the world where you can keep what you find.

Despite being one of the most photographed vistas in the Rockies these twin peaks are rightfully known as the "Deadly Bells."

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.