Berlin Fortress
Berlin, Germany · built 1650
The Berlin Fortress (German "Festung Berlin") was the fortification of the historic city of Berlin. Construction started in 1650. The ramparts, walls, moats and glacis of the 17th-century bastion fort ran around the historic city limits. The demolition of its ramparts began in 1740.
Fort data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).