America's largest man-made forest was planted in an effort to bring back the past.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

A bronze monument to the infamous radio broadcast in the real New Jersey town where the fictional Martians crash-landed.

The final resting place of many of New Jersey's most famous residents, including U.S. history's most in-vogue antagonist, Aaron Burr.

Abandoned railroad tunnel is home to a colony of three million Mexican free-tail bats.

Fantastic collection celebrating the final send-off.

Modern technology and live displays tell the story of the Pacific during WWII for the Internet generation.

The summer home of the largest colony of bats in the world.

Established in 1925, Kiddie Park claims to be the oldest amusement park in the U.S. - a cozy little time warp nestled in a shady corner of the modern world.

Three hundred years of preserved Spanish colonial history in San Antonio.

This museum showcases the history and contributions of the U.S. Army to the medical industry, both on the battlefield and off.

A National Historic Landmark with a scenic clock tower and park filled with deer and peacocks, plus a military museum.

The 40-foot-tall votive candle is the largest of its kind.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

The only museum with its curator—and her pets—buried inside.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

These machines have been collecting dust for decades.

The magic's in the hole!

The first North American landing spot for James Cook on his third voyage of discovery in the Pacific.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

This charmingly homemade amusement park has been growing for 40 years.

On the Oregon coast there is a natural hole that seems to be draining the sea.

Only known mainland rookery of the threatened Stellar sea lion.