A wunderkammer of gold and silver reliquaries and ancient saintly bones.

When Croatia became independent of Yugoslavia, the splintering governments left behind these concrete tunnels.

The only gulag ever to exist in socialist Yugoslavia.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

Croatia's "hairy stone" fortress is one of the most well preserved Istrian castles.

The final resting place of New Orleans' most famous voodoo priestess.

This family tattoo parlor has been inking religious pilgrims in the Middle East for 700 years.

A quirky house created entirely out of glass bottles combines a collector's spirit with an artist's flair.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

A mural of the Virgin of Guadalupe painted on the rock wall by canyon's religious namesake.

This 19th century jail was mainly used to incarcerate the drunk and disorderly.

These decaying bridges 1,000 feet high are a reminder of the skill it took to cross the Colorado Rockies by rail.

This hot dog-shaped diner has moved all around Colorado, never been to New York.

The wreckage of a World War II bomber is hidden high in the Colorado wilderness.

Colorado's only true geyser is hidden within the San Juan National Forest.

A collection of fading fantasy tchotchkes lines this dirt road in the Colorado wilderness.

The world's largest key collection features keys to the White House, Frankenstein's castle, and Hitler's bunker.

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."

The largest source of fossilized insects anywhere.

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

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

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

A ghost village sits atop a mountain within Jordan’s largest biosphere reserve.