Isengard

Isengard, also called Angrenost, Wizard's Vale, Nan Curunír, is one of the three fortresses of Gondor, housing the power-hungry Saruman from the Middle-earth franchise.

The realm was once at full power during the War of the Ring, but was destroyed afterwards when a rebelling Treebeard and his peers flooded it, ultimately leading to the demise of the kingdom's powerful ambassador, Saruman.