A walk through the historic city center, under the streets of Seattle.

42nd story Pyramid shaped penthouse tops Seattle's oldest skyscraper.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

This former coal gasification plant found a curious second life as a popular public park.

This painted blacktop brings the classic arcade game to life.

At a rest stop north of Seattle, the trunk of an ancient tree.

The classic lawn figurine now claims this wooded area as home.

One small town in the Pacific Northwest transformed itself into a Bavarian-themed tourist destination.

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

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.

Features unique photographic collections by women of the American West and historical attractions such as a two-story outhouse.

When ecosystems collide in the arid Southwest.

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.

The largest self-built castle in the U.S., six decades in the making.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

Take a dip in the world's largest mineral hot springs pool.

For 14 years, this former stray dog greeted every train passenger that arrived in Fort Collins.

Built in 1981 in collaboration with Andy Warhol, this giant piece of pop art stands on the campus of Colorado State University.

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

The highest bridge in America was built for an almost unnervingly small amount of money.

Hidden beyond a kitschy giant beetle is this remarkably sprawling collection of preserved insects.

This Boeing KC-97 tanker is now a restaurant for aviation lovers.

The narrow mountain road that carves a path between Florence and Victor is tied to ghost towns and ghost stories.