An enthusiastically interactive mining museum that won't let black lung ruin the fun.

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

The remnants of the base where US Army troops learned how to fight in extreme conditions.

A small collection of iguana-infested ruins hides amid Cancún's bustling hotel zone.

Few of the many visitors to this resort town know of its hidden Maya ruins.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

A Byzantine-era church hidden in a wooded area below the Acropolis.

The site of the "Bone Wars" between two rival paleontologists during the dinosaur rush of the 19th century.

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

A roadside attraction filled with an astounding array of gloriously wacky vehicles.

This sidewalk tribute honors Colorado's great culinary creation.

Swim or sail to this pie-slinging boat off the coast of St. Thomas.

The only place for a truly presidential dram.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

This stone marker honors the man who released Canada goose goslings in Fort Collins, Colorado.

This three-mile concrete levee in Pueblo, Colorado was transformed into the world’s longest painting.

Once a lonely sentinel on the edge of the Great Plains, this rebuilt trading fort offers a glimpse of life on the Santa Fe Trail.

This small piece of railroad history sits behind the parking lot of a chain grocery store.

Paleoamericans built these ancient walls high in the Colorado Rockies as part of an extensive hunting system.

This statue of an obscure comic strip hero stands as a tribute to patriotic service and a cautionary tale about embracing fads.

This 19th-century ranch is being transformed into a residential library with thousands of books about the natural world.

A mental health hospital dating back more than 139 years, now features a museum.

This underfoot portrait is the work of a disgruntled painter inspired by a tragic poem.