This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

The walls of the iconic dome are hollow and have a secret stairway.

Elevated freight railway turned wildly successful urban park.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Historic funicular railway, believed to be the shortest railroad in the world.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

Famous church recognized for both its unique design and disciplined monks that live according to the Benedictine discipline.

The first rural cemetery west of the Mississippi is home to the elaborate tombs of St. Louis' local beer barons.

A chessmaster's dream destination.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

An urban forest overtakes what was the greatest failure of utopic urban housing.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.