I play Minecraft occasionally with a friend on a shared server called The Land of Make Believe.
Mesa City (1470, 80, -3540) (185, 63, -450 nether) Alexandria (-330, 80, -740) (-52, 77, -124 nether)
Current tower: cylinder is 12 radius, the ellipsoid on top is 14 (i.e. would be a 28 block sphere, but I’m using half-slabs). I’ve just built level 18, so the next is 19.