now this wasn't on a single player world. this was on a friends server. if you want to know it, just ask via pm. i was just searching around for a hidden home and look what i find: and no. this isn't amplified. just regular 1.7.4. no amplifications.
its always awesome to see the strange things minecraft generates, i would convert that into little houses carved into the pillars of some and connect them with bridges.
i guess i can respond again, since everyone else is bumping :D (don't hate me :() That is awesome :) Gotta love those giant mountains
Actually, it probably is amplified. If you load a normal world, then change the settings to amplified in the minecraft folder, and then go to an unloaded chunk - it loads an amplified world. Ask your friend if he did this.