The Mainzer Zitadelle is situated at the fringe of Mainz Old Town, near Mainz Römisches Theater station. The fortress was constructed in 1660 and was an important part of the Fortress Mainz.
Wikipedia https://en.wikipedia.org/wiki/Mainz_Citadel
Official Website http://www.festung-mainz.de/zitadelle
Address 1 Zitadelle, Mainz 55131, Germany
Coordinates 49°59'35.121" N 8°16'27.515" E
