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

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

This otherwise unremarkable ski town building marks the site of Butch Cassidy's first robbery.

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

This spectacular track has run continuously since 1882.

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

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

This historic pub has maintained much of its 1906 decor, including a small sequestered room for women, where orders were slipped through a tiny window.

This cave system allegedly holds the "metallic library" of a lost ancient civilization.

On this wooded path, a stained-glass window creates a spellbinding forest cathedral.

This candy-colored storybook village originated as a 19th-century Methodist campground.

Ten shipwreck-shaped chalets lie along the sand dunes on Namibia’s Skeleton Coast.

A riverside park built around the ruins of a massive dam that collapsed in 1909.

This unusual rock formation looks like an apple that has been neatly sliced in half.

A men’s restroom became a sandwich shop.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

Dim sum, served in a grand old theater.

The oldest Italian café in Boston, this spot also serves as a veritable museum of vintage coffee ephemera.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

An enormous, inside-out glass globe built in 1935.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

A beautiful Victorian-era cemetery, complete with a miniature village.

This subterranean disco dance club in a Cuban cave comes with bright lights and a dark legend.

The second-deepest known cave on Earth, hidden in an extremely remote mountain region.