An outdoor sculpture park of giant pink robots and post-apocalyptic Christmas scenes.

Remembering the Alamo with a full-scale replica of the 1836 city.

Scale replica of China's ancient terracotta tomb warriors and Forbidden City are the side project of an eccentric millionaire.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

A spring-fed pool so deep it's used for scuba diving as well as swimming.

A collection of massive stacked rocks in Texas includes a snarky note on the benefits of modern technology.

Smooth basaltic rocks tell a tale of ancient glacial waterfalls.

These millipedes glow not out of attraction, but as a not-too-subtle warning.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

A dwindling menagerie of anthropomorphic oil derrick animals still dot the barren California landscape.

The fifth-longest natural arch in the world, and the longest outside China.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A reproduction of earth's many biomes.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.