An errant donkey ushered in a new era of mining in Nevada.

This tiny cluster of abandoned buildings looks like the future of the ghost town - today!

This silver-mining camp has been active intermittently from the 1860s to the present.

Once a staging site for World War II munitions.

Two craters, which probably erupted within the last 1,500 years and are now filled by alkaline lakes, represent Nevada's youngest known volcanic activity.

This Stonehenge-inspired solar calendar stands alongside a landfill, in the middle of the Nevada desert.

The self-proclaimed gateway to the Extraterrestrial Highway.

Now a city park, this site started as a stage stop, then was a working ranch, and finally became a dude ranch that specialized in letting wannabe divorcees establish Nevada residency.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

Turntable anonymously received orphans, alms, and groceries.

A bookstore dedicated to the intersection of comedy and art.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

A beautiful but toxic fountain of mercury.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

An early 20th-century bullring converted into a modern shopping center.

This colorful statue welcomes visitors to a Barcelona park.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

This skeletal, unfinished Gothic church once housed a miraculous masterpiece by Raphael.

Improbably, the largest wildlife refuge in the conterminous 48 states sits just northwest of Las Vegas, Nevada.

A luxurious doomsday bunker hidden beneath an unassuming Las Vegas home offers the best of subterranean suburbia.