Materials Needed:

  • Stone bricks
  • Prismarine
  • Glass
  • Oak wood
  • Water buckets

Steps:

  • Build island platform
  • Create castle walls on island
  • Add bridges or docks
  • Surround with water defenses
  • Build underwater rooms

Pro Tip:

Add underwater glass tunnels for epic views.

10. Mega Kingdom Castle

A mega kingdom castle is the ultimate build in this 10 Minecraft Castle Ideas list. It is huge, detailed, and designed like a full city.