A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

The 7,000-year-old calcium carbonate formation creates a magnificent natural bridge.

This Transylvania County city is home to a rare white squirrel population that is descended from an escaped carnival animal.

One of the oldest living oak trees in the Southeast.

This bare tree might not have leaves but it is constantly clothed in festive decorations left by mysterious local benefactors.

Twenty-eight years after this local landmark was washed ashore by hurricane Hugo, it was washed away by hurricane Irma.

This ultra-modern California span is actually a titanic solar clock in disguise built by famed architect Santiago Calatrava.

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

Submerged lava formations create incredible waterworks.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

Fossils, railroads, and waterfalls!

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

A glimpse into the lives of the the Miwok and Paiute people in Yosemite National Park.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Granite outcropping that the state's tourism bureau doesn't promote because of its delicate ecosystem.