Where dogs like the rare "Fire-Tailed Border Cocker" run free on the mountainside.

This Costa Rican topiary park is a surreal garden of unearthly delights.

Disused penal colony features prisoner artwork, some sketched in human blood.

Costa Rican accommodation resembles a crash site, but with a nice balcony.

One Costa Rican island is so beset by illegal shark poachers that the local rangers have built an entire bridge with their confiscated gear .

A museum dedicated to the alleged Roswell Incident.

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

In the remote high desert of New Mexico, a strange array of poles beckon fury from above.

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

The outcropping is graffitied with the name of the beloved musical Muppet television series.

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

On the side of a remote mountain, a stone face bearing an inscription of mysterious origin.

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.

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

A unique geological area spiked with wind-carved rocks that resemble teepees.

Natural sonic phenomenon comes with a grisly legend of murder and blood.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

This is one really big nut.

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

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

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.

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

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