"Vulcan's cave" at the entrance to the Solfatara, near Naples: jets of steam emerging from the rock floor, watched by spectators. Etching.

Licence: Public Domain Mark

Credit: "Vulcan's cave" at the entrance to the Solfatara, near Naples: jets of steam emerging from the rock floor, watched by spectators. Etching. Wellcome Collection. Source: Wellcome Collection.