I build like a huge as wall then hated it and litteryly built up a whole wall of TnT next to it.
Shame you cant like undo or restart your world because after blowing up my arch I found a huge valley type thing and tonnes of huge caves.
yes i need to talk to a friend of mine who has all the server info becaus we did start making one but then nobody was interested but now with 1.8 i think it might work so it should be this weekend when hes home from college