The largest earthwork effigy in the world.

This was once the home of Gahan's Saloon, Denver's most storied speakeasy.

This museum offers an actual time machine back through Colorado's past.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

A geological mystery on Camelback Mountain.

A Wild West jailhouse that slid down the mountainside.

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.

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

This Route 66 classic sports a giant fiberglass rabbit that you can ride.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

What is the Thing?

A Saint Nicholas-themed ghost town in the Mojave desert.

An homage to everyone's favorite prehistoric cartoon family.

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

A centuries-old church stands as a testament to Boston's "father of architecture."

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

The oldest working bell set in North America, the bells at Old North Church sat silent for their first four years in Massachusetts.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.