Conserva di Valverde, Cistern in Bologna, Italy
Conserva di Valverde is a Renaissance cistern in Bologna with an octagonal upper chamber and lower levels connected by brick shafts. The underground system includes eight water collection basins that gathered and distributed water to the city above.
Architect Tommaso Laureti designed the system in 1563 to supply water to the Neptune Fountain and other public fountains in Bologna. The construction was part of a broader urban renewal effort carried out under papal patronage.
The name Bagni di Mario spread in the 19th century, when the cistern was wrongly taken for a Roman spa of the consul Gaius Marius. The complex reopened to the public in 2017 after restoration. Its octagonal hall and the Cisternetta, a second small octagonal chamber, are the spaces visitors see.
The system runs beneath the city and connects to the Neptune Fountain in central Bologna, so visiting both locations helps you understand how water reached the public spaces above. Access to the underground chambers requires a guide and is not freely available.
Ancient limestone deposits remain visible in the ventilation chamber, marking centuries of water flowing through the structure. These mineral traces show physically how long this engineering system has been operational.
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