Piscina Mirabile

The Piscina Mirabile is a monumental Roman cistern at Bacoli, associated with the water supply of ancient Misenum. Its repeated pillars and vaults give a utilitarian reservoir the spatial force of a great underground hall.

Why it matters

The cistern belonged to the infrastructure of the Roman naval base and the wider Augustan aqueduct system supplied from Serino. Its scale reveals the importance of storing water for a major harbour community and fleet.

What to notice

Forty-eight pillars divide the interior into five long aisles. Parts of the structure were cut into the tuff, while masonry and waterproof finishes completed the reservoir. A lower settling and cleaning basin helped manage sediment, showing that maintenance was part of the design as well as storage.

Context and history

The cistern developed within the early imperial water system serving Misenum. Additional vaulted structures belong to later changes in the complex. Renaissance study and Grand Tour interest gave the reservoir a second history as an admired architectural monument, valued for the monumental effect of its repeated supports and vaults.