One of the best places to dig—some say on the planet—for six different types of chalcedony.

This Colorado gallery is primarily for cars, but its collection also includes quilts, pottery, and more.

This Rocky Mountain mansion was the luxurious home of the authoritarian leader of a company town.

No one knows exactly how deep the world’s deepest geothermal hot spring is.

A short but powerful waterfall resides amid Colorado’s Great Sand Dunes.

This National Natural Landmark is one of the best examples of a “mass wasting” in the world.

Inside this shop, visitors are treated to a unique blend of natural history and art.

This massive home was constructed by one of the greatest conservationists in Colorado history.

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.

A small store filled with animal skulls and other curiosities.

A home covered with elaborate mosaic and other pieces of art.

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

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

Once strictly off-limits, this lower level housing curious and priceless vehicles of the Petersen Automotive Museum is now open to the public.

A ghost town at the airport is now a refuge for blue butterflies.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

Rainbow-hued local gem in Venice.

Sister store to the Echo Park Time Travel Store.

This vintage car parts store is also a museum devoted to a squat little gem of automotive history.

From sax to spuds, get 'em all at this landmark music establishment.

One man's vast collection of artifacts and ephemera from matchbooks and postcards to vintage neon signs and cars.

On the edge of grassland in northeastern Colorado, these rock formations are some of the few remnants of a high plain that has eroded away over millions of years.

A world of craftwork elegantly curated in a historic brick warehouse.

The largest glacial erratic boulder on Cape Cod.