Newtopia Castle

Newtopia Castle (also known as King Andrias' Castle) is the home of King Andrias.

Background
It remained still in Newtopia for most of Season 2. In "True Colors", Andrias used the Calamity Box to power up his castle's 4 thrusters at the lower part that enables it to fly in midair. Then it sent out a type of signal to reactivate the Ruins of Despair with other factories causing them to recreate the Frobot military force under Andrias' command.

Appearance
It has an energy base cannon on top of the roof that once activated would located a target such as North Tower and fire a warhead/plasma at said target, then caused an explosion that seems to be similar to made by humans on Earth. It has various hidden passages and chambers, such as a basement that has a flooded tomb full of strange creatures, two halls of mirrors, a chamber with plants that don't need sunlight to grow and a torn portrait of Andrias with his former friends, mainly the unknown frog and toad. Other than that, the Core lives in a hidden basement when Andrias goes down there to have private talks.

Trivia

 * The castle was probably inspired by Laputa in Castle in the Sky.