Medieval Castle Modular Vol 1 pack is perfect for your medieval, realistic, or fantasy stronghold! It’s possible to build fully enterable castle and donjons using over 300 modular meshes. You can create a whole medieval castle fortress very fast. It's possible to do square or round towers, donjons, custom walls,... Machicoulis and Hourdes are included, as well as gates to be historically accurate. It's usable for video games, archViz, cinematic's, etc. There are 1 demo level and several overview levels to demonstrate the possibilities.
Available here : https://www.unrealengine.com/marketplace/en-US/product/medieval-castle-modular-vol