This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Communication Line of the Round Tower. Communication Line of the Round Tower extracted from An exact Plan of the town castle moles and bay of Gibraltar europeana eu html start query gibraltar startPage qf TYPE IMAGE qf YEAR qf YEAR qf YEAR qf YEAR qf YEAR qf YEAR qf YEAR qf YEAR qf YEAR qf YEAR rows Rijksmuseum Amsterdam