Semaphore saints, a golden dragon's head, and a stone carved with religious warnings all call this cathedral home.

This innovative steam machine was no doubt the most famous of the pioneer locomotives.

An incredibly well-preserved piece of ninth-century Viking poop.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

This small interfaith chapel lies not far from the rim of the Grand Canyon.

An off-the-beaten path cave with an underground lake.

Legend says train robbers stashed their gold within the depths of this unusual cave.

In Tucson a giant metal snake helps pedestrians cross a busy highway.

Miniature art that tells an enormous story.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

In this small Phoenix taxidermy emporium, you can find everything from a squid in a jar to a freeze-dried toad.

Limestone caves with spectacular showcase chambers.

This historic national park is covered in the stunning ruins of red rock pueblos.

The Magical World of George Phar Legler.

See massive fossils that are over 200 million years old in northeastern Arizona.

A reproduction of earth's many biomes.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

Dramatic river bend surrounds a natural red-rocked pedestal.

Most-visited and most-photographed slot canyon in the American Southwest.