A grandiose octagonal home crowned by a large dome stands out among the antebellum mansions.

This strange sculpture of a menacing skull surrounded by sun rays was discovered at the foot of the Pyramid of the Sun.

A view-altering observatory at the University of Texas.

This eclectic, mosaic-clad home includes a bamboo ping-pong loft and a "Whispermaphones" intercom.

A preserved stretch of ancient fossilized trees with an impressive gem collection to boot.

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

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

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.

A speakeasy takes on Chicago's drinking culture.

Hidden away in the city of Madison, Wisconsin is a nearly forgotten home that Frank Lloyd Wright built for a childhood friend.

The bugs crawling down the front of this office building are almost as big as a '68 VW Beetle.

Once a speakeasy operated by Al Capone, this Milwaukee cigar bar is now a haven for ghost hunters.

The only rotating bar in New Orleans has been slowly spinning since 1949.

The subtle science of a master molecular gastronomist.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

Five candy-colored villages on the Italian Riviera.

An exquisite grouping of structures made from 10 tons of invasive saplings.

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones' Locker.

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

A spring-fed pool so deep it's used for scuba diving as well as swimming.

The highest point in Texas is capped by a big silver pyramid.

The stone labyrinth in this New Orleans city park was laid to symbolize healing in the wake of Hurricane Katrina.

Belly up to the bar in Cowtown, don't forget to buy some boots.