This elegant Colombian fortress was one of the torture headquarters for the Spanish Inquisition.

Every equinox this Maya pyramid puts on a spooky ancient light show.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

One of Mexico's least-visited archaeological sites is tucked away inside a theme park.

On the shores of Lake Superior, a small group of monks makes sacred sweets.

This missionary's legacy looms large over the Upper Peninsula of Michigan—literally.

Large one-man sculpture park in Michigan.

This lone tree and dramatic sandstone outcropping are so beloved by Michiganders they can be found on one of the state’s coins.

Watch the ships come in on Michigan's 210 ft. high observation deck in Sault Ste. Marie.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

This shallow cave got its name from copious amount of human bones found inside.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

Unique Michigan homes look like something out of Tolkien's "The Lord of the Rings."

Easily overlooked in favor of the wineries that dot the region, this blast from the past is equally worth the visit.

The park is home to the United States's only still-operating Dutch windmill.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

The world's largest collection of fine-scale miniatures and one the nation's largest collections of antique toys.

Four, 18-foot-tall badminton shuttlecocks lie scattered about the lawn of a Kansas City museum.

The oldest continuously occupied public building in the United States.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

This southwest-styled home in Santa Fe claims to be the oldest house in America thanks to an ancient bit of foundation.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.