King Herod built Masada in 31-37 BCE to be a refuge for him and his family. It was located in the southern district of Israel, on the edge of the Judaen Desert. Even though Masada was 300-400 meters high, it was completely surrounded by walls to ensure the safety of its residents. The Jews found sanctuary in it for 3 years starting in 73 AD before their mass suicide. Masada was a legend for 13 centuries until it's discovery in 1828.