Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

While not recognized by Guinness, this chocolate waterfall is likely to be the world's largest.

This Alaska library may be the only one in the country that allows you to check out pieces of taxidermy.

A high school astronomy enthusiast designed this model of our solar system to be traversed on foot.

A hidden garden of stones engraved with scriptures, a Joseph Smith Sphinx, all carved by one man.

This whimsical stacked cabin looks like something out of a children's book.

Mind-blowing carvings and fantasy ice scenes grace the largest year-round ice environment in the world.

A trading post in the North Pole where children send letters.

Essence of hound's tongue and tincture of bloodroot are just the tip of the herbalist iceberg at this beautiful, impressively-stocked apothecary.

This working class sculpture pounds his hammer all the livelong day.

The first park built over a freeway is a brutalist masterwork.

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

A colorful architectural gem in Seattle’s uniquely modern Central Library.

A wall of chewing gum moonlights as collective art.

A giant Troll lurks under one of Seattle's oldest bridges.

A beautiful 62-acre Catholic shrine and botanical garden.

Portlandia is the second-largest copper repoussé statue in the United States.

On the Oregon coast is a natural hole that seems to be draining the sea.

A memorial for the mustachioed record-setting runner.