These molds for fiberglass statues have formed an eerie, accidental sculpture park.

This cave holds a surprisingly colorful variety of geological oddities.

This pebble beach is so beautiful that taking its rocks is against the law.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

An ancient system of freshwater caves filled with animal bones, including that of species long-extinct.

The second-largest ceremonial mound in the United States is an artificial hill that is loosely shaped like a pentagon.

Statue dedicated to the star of an old television show.

One of Frank Lloyd Wright's final works was this UFO church.

A house and yard adorned with bizarre concrete sculptures in a Milwaukee suburb.

Complex aquaponics systems allow fish and plants to grow in harmony.

A lovely hidden waterfall right off the highway is well worth a stop.

A popular rock that acted as a waymarker for American pioneers.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

A fitting attraction for the corn capital of the world.

A cemetery housing wild west legends in South Dakota.

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

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The largest self-built castle in the U.S., six decades in the making.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

This lagomorph-obsessed Route 66 emporium is home to a giant jackrabbit that sits in a bunny graveyard.

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

This massive roadside mascot was the first version of the giant to illustrate his butt.

A museum devoted to the victims and the survivors of the most catastrophic fire in American history.