When this 160-year-old church was being built, a stonemason included a hidden homage to his late daughter.

One man's love for East Coast diner culture brought an entire eatery all the way from New Jersey to Colorado.

A prehistoric rock shelter that's literally in someone's backyard.

In the middle of a suburban Denver neighborhood is a cave that once provided solace for a prominent Ute chief and his family.

An ADA-accessible trail and deck offering stunning views of Colorado’s Mount of the Holy Cross.

This old train trestle and collapsed tunnel once allowed the railroad to negotiate the steep slopes of the Colorado Rockies.

Central City celebrates its most famous madam by racing beds down Main Street.

The burial grounds of a secret society includes fences topped with fake Tesla balls.

Toss a Frisbee through the ruins of this Colorado gold mining town.

A museum dedicated to the mysterious cryptid.

Above Breckenridge, a destructive mining technique sits sunken in a small pond.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

A hotel with a rich Wild West history of miners and bootleggers.

Isak Heartstone, a 15-foot wooden troll made out of recycled materials.

Get up close and personal at this Fresnel Lens.

A natural spring situated on the grounds of the Hawthorne estate.

The former home of Dr. E.B. Henderson, also known as the "Father of Black Basketball."

Once a sewer culvert, this road tunnel now offers cyclists and pedestrians a subterranean stroll under the C&O Canal.

These rows of World War II-era bunkers were the scene of some of the infamous Mothman sightings.

The world's largest fully steerable radio telescope.

This small West Virginia park is a land trust holdout against mountaintop removal mining.

Home of a 28-foot tall stalagmite known as the War Club.

One of the few surviving examples of the first lock and dam system built on the Ohio River.

This abandoned train tunnel has been the subject of countless ghost stories for years.