Spirellica is a map for Legends: The Game. It features a large bowl that is shaped like a fort on the exterior, a tall mountain with a spiral ramp, and a deep pit with a spiral ramp. These features were created in a CAD program, exported to VRML and then converted to a heightmap with 'mesh2hmap'. The original heightmap (before extra terraforming) can be seen to the left.
(Right Click and 'Save As')
You will need to install Legends to use the map. In Linux, place the "unf" file in your ~/.legends/legends directory, in Windows, place it in C:\Program Files\Legends\legends. Below are some in game screenshots.