User blog comment:Mrob27/Geology excavation project/@comment-4583259-20111108164548

You can build 63 blocks up from "ground level". Beyond that it "beeps" at you if you try to build higher. However you can get a higher vantage point by using the jetpack. The best jetpack lets you fly up another 29 blocks. This photo was taken from (about) 63+20=83 blocks above ground level:



However you can do a lot better than that, using the Infinite_Jumping_Glitch.