This crumbling UFO is one of only a few remaining "moveable ski chalets" of its kind.

American bison herd descending directly from a Bronx Zoo breeding program that saved the species from extinction.

Ruins of a once-opulent grand Victorian resort.

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

In the fictional world of Kcymaerxthaere, this was the former home of the Marshal of Gravity and the site of his tragic death.

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

A grove of colossal man-made flowers built to collect the sun's rays.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

Turning night into day in Victorian-era Austin to thwart a serial killer.

This failed condo development was reborn as a street art hub.

A popular swimming hole that hides one of America's most deadly diving spots.

An emerald-green grotto just a short trip from Austin.

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

This sacred cavern, 400 feet deep, is home to millions of bats and an ancient burial ground.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

Rippling sand dunes frozen in the Arizona rock.

Come for the speed, leave in love with the desert.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The highest peak in Utah is the hardest to reach, but only if explorers choose the hard way.

Sandstone rock formations that look like they belong on the cover of a progressive rock album.

A hidden garden of stones engraved with scriptures, a Joseph Smith Sphinx, all carved by one man.

A shady solar power system that couldn't hold up to the harsh desert conditions.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.