This innovative mill was built for a legendary gold mine that never came to be.

The fifth-longest natural arch in the world, and the longest outside China.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

Oddly shaped rock formation, misassociated with a nearby utopian community.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Two tall rocks sit at the center of this site, once the home of a large Ancestral Puebloan community.

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

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

A technicolor place of worship for Elevationists.

Yo, Adrian!

A layered tribute to the work of mosaicist Isaiah Zagar.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

This elaborate towering structure was once famed for its revolutionary height.

This beloved marketplace mascot poops money and grants good luck.

South Philadelphia is home to Keith Haring's only surviving in situ collaborative public mural.

The oldest surviving botanic garden in the United States.

The singer, actor, and activist lived here during his final years, and now it’s a museum dedicated to his legacy.

The oldest of only three existing statues of the great novelist stands in a city he did not care for.

Hidden behind West Philadelphia rowhomes is a haven for migratory and local bird species both ordinary and rare.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

The "Jade Museum" is full of thousands of intricately carved works of art made from various precious stones.

Carrying on the legacy of a short-lived experimental school tucked away in the mountains of North Carolina.