Nuclear reactor created the plutonium used on Nagasaki.

This oak sculpture at the edge of a small woodland is nine feet tall and shrouded in mystery.

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

The scene of the United Kingdom's most famous UFO incident, dubbed the "British Roswell."

When waves crash onto this section of beach, the rocks sing a song.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

An abandoned observatory in the middle of the Illinois prairie.

Hidden in the Chihuahuan Desert resides an amazing collection of petroglyphs.

The ruins of this former mining boomtown once housed over 3,000 people. Now, the population is two.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

The ruins of this abandoned fort now stand as a picturesque reminder of America's march West.

Crumbling remnants of what was once a booming town full of silver.

Once part of a dam servicing an early 19th century grist mill, the tucked-way falls are a tricky-to-find urban oasis.

A winding medieval path was used by mourners to carry their dead to the nearest church.

A sculpture of a flying hawk made from colorful car doors.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

A wealth of pop culture statuary and green chile dishes give this roadside restaurant clout.

In the middle of a desert subdivision, there is supposedly an impact crater site from Kcymaerxthaereal times.

A one-of-a-kind sundial at the Very Large Array honors a radio astronomy pioneer, incorporating the original piers from his breakthrough radio telescope.

Home of the International Space Hall of Fame.

A clear blue swimming hole with hidden caves, still unexplored.

A 2,000-ton rock resting in a state of a delicate balance.

This unassuming layer of clay boasts an out-of-this-world origin story.

On the edge of the Valles Caldera National Preserve, these rock formations create an eerie landscape.