Wallace's Cave is situated in Roslin Glen, in Midlothian, Scotland beside the River North Esk. It is also known as Hawthornden Castle Cave, after the nearby castle. It takes its name from William Wallace who participated in the Battle of Roslin, which took place nearby on 24 February 1303. The cave was formed under water from limestone between 363 and 325 …Wallace's Cave is situated in Roslin Glen, in Midlothian, Scotland beside the River North Esk. It is also known as Hawthornden Castle Cave, after the nearby castle. It takes its name from William Wallace who participated in the Battle of Roslin, which took place nearby on 24 February 1303. The cave was formed under water from limestone between 363 and 325 million years ago.