The building stands within a quiet, postcard-perfect New Mexico village.

A burnt-out motel with priceless Native American artwork in the basement, redeveloped into apartments.

This museum started as a collection of Manhattan Projects and continues to add exhibits as they are declassified.

This quirky hot springs town known to locals as "T or C" was named after a radio show.

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

"I did this all while you were watching TV."

A multi-storied adobe complex has been inhabited for more than a thousand years.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

Stone memorial that's said to predict the death of the pope and the site of the Cadaver Synod.

Stumbling upon this whimsical wooded garden is like stepping into an enchanted forest full of philosophical musings.

Beautiful views and Roman-style statues on the Italian coast.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

Southern Italy's spinning top village.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

An Italian ghost town that fought obscurity, until a mysterious illness brought it to its knees.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

This medieval Italian town is a sheer (and beautiful) cliffside defense.

This Italian foot path winds through the mountains via 52 individual tunnels.