Skycastle was one of the Skywars maps on Minecraft Central. The date of its release is unknown and so is its creator. It was removed as a part of the big Skywars update in 19th February 2016.
On Skycastle there were two types of islands players could spawn on. One of the types had a stonebrick-themed tower, the other a netherbrick-themed tower. Wood could be obtained from the pillars. Each island had a chest and no cave, so you had to start mining from the surface. The centre had a level 8 enchantment table, 8 chests and a diamond block.