"Giant decaying stalagmites" is a perfect description. Gaudi designed it by hanging weights on lots of loops of string, drawing the result, and then turning it upside-down. It's a mad, genius way of designing a building - it looks like it's about to fall down, but it's actually incredibly sturdy, because it's working with gravity. Bloody scary to climb, though.

God knows if they'll finish it in our lifetimes, though - building work has been going on for a hundred years or so. Cathedrals take time, I guess.