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.

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

Rodin's famous depiction of Dante's 'Inferno', amidst a sculpture garden of many of his other works.

One of the indelible moments of the American Revolution took place at this location.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A Manhattan office building is home to the world's largest chess board.