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

This cavernous abandoned marble mine is popular with ice skaters in the winter.

What is the Thing?

An urban laboratory.

An homage to everyone's favorite prehistoric cartoon family.

A motel dedicated to Southwestern nostalgia.

This collection of Wild West movie memorabilia also claims to hold some secrets of the Lost Dutchman's mine.

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

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

A living snapshot of a different time in America is preserved and maintained by a community of volunteers.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

These free-roaming horses were once destined to disappear from the land.

Open since 1938, this diner has kept its fountain, malt machine, and all the gum that greasers left beneath its counter.

A former department store turned into a quirky restaurant.

Come for the pizza, stay for a performance on the world's largest theater pipe organ.

The world's only teal arches exist in a city that cares more about its aesthetic than an Instagram influencer.

This church on a Tohono O'Odham reservation has stood since 1797.

A bygone village occupation lives on via this quaint public chalkboard.

A 60-foot-tall tower provides unparalleled views of the southern Green Mountains.

Two distinctive homes on a New England village green look like a couple of frosted wedding cakes.

Who is this marble man, perpetually creeping up the steps of his own mausoleum?

A strange, heartwarming, decades-old declaration of love on a New Hampshire roadside.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.