These curious caverns have been home to mushrooms, gangsters, and disco.

Turning night into day in Victorian-era Austin to thwart a serial killer.

A high-octane shrine to the greatest Texans who ever lived.

Locals dubbed it the "Owl Building" because of its bird-like appearance.

A store full of vintage and indie toys designed to bring out the kid in even the crustiest of adults.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

A free, canine-friendly alternative watering hole near the more famous Barton Springs.

Home to an endangered salamander, a full moon celebration, and a large spring-fed outdoor swimming pool.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.