English: Plan of the Roman Castra of Mehadia (also known as Praetorium), in Mehadia, Romania. Published in the 1726 work Danubius Pannonico-Mysicus, Volume 2 by the Italian naturalist and soldier Luigi Ferdinando Marsigli (1658 – 1730).

English: 1726 work by the Italian naturalist and soldier Luigi Ferdinando Marsigli (1658 – 1730). It is a natural history encyclopedia of the lower Danube, published in 6 volumes in both The Hague and Amsterdam. The extensive work covers cartography (vol. 1), classical studies (vol. 2), mineralogy (vol. 3), fish fauna (vol. 4), birds (vol. 5) and other subjects (vol. 6).

Detailed information by volumes:

• Volume 1: In tres partes digestus geographicam, astronomicam, hydrographicam contains geographical, astronomical and hydrographical data related to the Danube.
• Volume 2: De antiquitatibus Romanorum ad ripas Danubii covers Ancient Roman remains by the Danube.
• Volume 3: De mineralibus circa Danubium effossis reviews minerals in the Danube area.
• Volume 4: De piscibus in aquis Danubii viventibus discusses the fish of the Danube.
• Volume 5: De avibus circa aquas Danubii vagantibus, et ipsarum nidis catalogs the birds Marsigli encountered along the Danube. Includes 74 plates after drawings by the Italian artist Raimondo Manzini (1658-1730), including 59 birds and 15 nests with clutches, some of the earliest illustrations of its kind in the history of ornithology
• Volume 6: De fontibus Danubii. Observationes anatomicae. De Aquis Danubii et Tibisci. Catalogus plantarum. Observationes habitae cum barometris et thermometris. De Insectis covers the springs of the Danube, anatomy, plants, insections and observations on pressure and temperature.