An 18th-century Spanish watchtower made entirely of seashell and concrete.

A building so large that it has its own weather.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

Most-visited and most-photographed slot canyon in the American Southwest.

See massive fossils that are over 200 million years old in northeastern Arizona.

An homage to everyone's favorite prehistoric cartoon family.

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

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Once the product of an inexplicable gold strike, this ghost town is now home to one man and his love of classic machines.

This historic collection of Native Alaskan artifacts was resurrected through a partnership between the WPA and tribal artisans.

Open day and night, a church with three pews and Bibles.

One of two side-by-side totem pole parks dedicated to educating visitors on Tlingit history and culture.

Roadside collection of 65,000 signs.

A historic freight system that found the true gold rush is in tourism.

A tiny wilderness cemetery commemorates the deadliest episode of the Klondike Gold Rush.

This decommissioned DC-3 now forever points into the oncoming wind.

Buy your friend a drink or staple some cash to the wall for the next guy at the Salty Dawg Saloon.

At 238 feet above the bottom of a gorge this span is known as the biggest thrill on the road to McCarthy.

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.

A suburban street in Anchorage doubles as a runway, and each home has its own airplane hangar.

Permanent exhibit reminds visitors of the Exxon Valdez.

Siberian husky that delivered a life-saving antitoxin.

An Alaska livestock farm devotes itself to harvesting wool from creatures that once ran with mammoths and sabertooth tigers.