Basically a world save where I built a fortress on an island near the initial spawn, you'll find it easily following the paved road. The fortress has 2 courtyards, 2 gates, 1 pier for boats, some towers (one of them reinforced to build a windmill on top), walls with wooden hoardings and a keep with 8 rooms (9 if you consider the attic) where 6 of them have a fireplace.

There is plenty of space for tamed animals, workstations and your friends. The interiors of the buildings are empty and have only floors and stairs. Unfortunately, it is very likely that FPS drops will occur.
 
Sorry if this isn't one of the best world seeds, I didn't think about it until I had half the castle built.



WARNINGS:
 
* Do not remove the wood iron beam that are inside the wood beam in the corners of the walls and floors inside the buildings, the removal of these structures can cause parts of the buildings to collapse;
 
* If you want to prevent enemy mobs from spawning inside the fortress during raids, build several workbench inside the perimeter of the walls;
 
* Do not let the Trolls approach the walls, their attack can cause damage to the wood iron beam that help to support the stone walls of buildings;



Installation: 
 
1. Extract the contents of the compressed file that was downloaded in some folder;

2. Copy/Cut the files that were unzipped;

3. Paste the files inside the directory "C:\Users\YOUR USERNAME\AppData\LocalLow\IronGate\Valheim\worlds";

4. Open the game, search and select the world save "IslandFortress" in the list of worlds;

5. Start the world and play.



Recommended Mods:

Better Ladders

Instant Building Repair

More Gates