Neronian Cryptoporticus, Rome

If ancient Romans had a secret runway for emperors to stroll, scheme, and avoid bad weather, the cryptoporticus was it. The name itself sounds mysterious, but no—it's pure Latin: “crypta” means hidden space, and “porticus” means portico. Put them together, and you get a covered, semi-underground corridor—basically the Romans’ idea of a climate-controlled hallway long before air-conditioning was cool...

These vaulted passageways often propped up the fancy structures built above them, like villas and forums. Picture a sleek Roman marble terrace on top… and underneath, a shady corridor perfect for political gossip, secret strolls, or escaping the scorching sun. In the ancient letters, the term "cryptoporticus" was often used interchangeably with "crypt," indicating an underground space.

One of the most famous examples of a cryptoporticus is part of the Domus Tiberiana complex, the first imperial palace on the Palatine Hill. Built during Emperor Nero’s era—from around 54 to 68 AD—it stretches a dramatic 130 meters (because emperors didn’t do “short”). Tiberius and his successors—Caligula, Claudius, and Nero—eventually blended their separate palaces into one mega-residence, and the cryptoporticus helped stitch it all together.

Eventually buried beneath the Renaissance Farnese Gardens, the corridor still survives with its tiny windows, mosaic floors, and what remains of its once-fancy ceiling. The original stucco—complete with cupids and leafy décor—now lives at the Palatine Museum, safely preserved from humidity… and curious fingers.

So, next time you walk through a dull hallway, just remember: the Romans invented one so stylish it became a palace highlight—minus the fluorescent lighting and office carpet...