This hunter-gatherer architecture is believed to be the oldest religious complex known.

Mausoleum and Holy Seat of Antiochus I of Commagene.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This Aztec structure remained hidden until the demolition of a supermarket exposed the lost temple.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

A Jenga-style cylindrical tower of books that appears to go on forever.

This vertical pinnacle in China was the inspiration for the floating mountains in the movie “Avatar.”

For those with no fear of heights: a skywalk 4,700 feet up on a Chinese mountain.

This clock was gifted to Mexico as a show of gratitude for its long history of welcoming Arab migrants.

A cave's rare beauty held a cavernous secret hidden underground.

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

Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

These aggressively sustainable art homes look like something out of 1970's science fiction.

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."

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

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.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

The old Route 66 town straddling Texas and New Mexico died along with the Main Street of America.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

An emporium for the weird, creepy, rare, and just plain gross.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.