I remember your overdone castle, but that was made up with the lava signs that people tended to break and ruin anything under them.
I did build some nice things too.. The M1 Bridge A.K.A 'Troll Bridge" as it always had at least 5 chunk errors whenever you wanted to cross it. M1 Industries, which had nothing special going for it until Laithes tried hopping off the roof onto the top of my house, and fell down the chimney into my fireplace. In the process of killing my fireplace's fire so he didn't turn into cooked pork, he set the roof of my house on fire.. which skipped merrily across the top of my house to his house and WTFpwned a part of it.
I also built most of the 1st Artillery Battalion's HQ. Sadly, it is mostly remembered for the fact iPope insisted on building 'Modern Art' Shitpile in the middle of the HQ until he was banned from the server.