According to one local tradition, the entrance to the Voodoo underworld can be found in New Orleans through seven gates scattered throughout the city's French Quarter.

The restaurant keeps a hidden séance room on the second floor and reserves a table for the spirit of the former owner each night.

Feast on award-winning birria tacos from a food truck inside this neon robo-tiki bar.

This video store is a horror buff's dream.

Hiding behind a grocery store is a spectacular cavern carved as part of an old limestone quarry.

The secret city built by the Manhattan Project.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

All that's left of the quintessential "cabin in the woods."

Concrete igloos standing across from what remains of the Michigan Central train depot.

Enormous small-business mecca in the Midwest, serving dozens of artists.

To truly appreciate Detroit's landmark skyscraper, you have to step inside.

One man's attempt to create an artistic wonder on a run-down block in Detroit.

A wacky two-story folk-art assemblage of carved and found objects, with lights, motion, and sound now in need of financial support.

A small Wyoming town is home to the state's oldest-operating soda fountain.

Try a classic Necco candy bar being resurrected in a small suburban shop.

The grandiose interior of this bar speaks to its past as home to famous jewelers and railway offices.

A nearly 100-year-old dining car in upstate New York embodies the golden age of roadside dining.

This unassuming retro burger joint was billed as “diner of the future” at the 1939 World's Fair.

Behind a modern brick exterior lies the oldest continuously-operating lunch-car diner in the United States.

Formerly the world's largest, this Willy Wonka-esque contraption runs 24/7.

Like a kitschy mirage in the Mojave, this eatery serves up classic 50s-style diner meals and a dinosaur sculpture garden.

A former department store turned into a quirky restaurant.

A 17th-century bezoar, dirt from an infamous site, and other curios decorate this unusual bar.