Agnano, Volcanic crater in Naples, Italy
Agnano is a volcanic crater near Naples with a diameter spanning several kilometers, containing multiple mineral springs that emerge at varying temperatures from the volcanic ground. The crater floor was a lake for centuries until it was drained in the 1800s.
Ancient Greeks and Romans built bathing facilities here to use the thermal waters and benefit from the site's healing properties. In medieval times a lake formed inside the crater, which was eventually drained in the 1800s.
The thermal springs here have been used for healing purposes for centuries, and visitors can still see how people come to soak in the warm waters that emerge naturally from the volcanic ground.
The site is reachable by public transportation from central Naples, particularly through the Fuorigrotta district, where marked paths lead to the crater. The area is accessible year-round and easy to explore on foot with clear routes to follow.
The crater floor was submerged for nearly 2,000 years before being drained in modern times, which preserved traces of ancient bathing structures beneath the surface. Today the site features both thermal activity and modern sporting facilities that share the drained crater floor.
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