There are of course projects players are working on, such as the Leaning Tower of Pisa, Villager Trading Hall, Wither Skeleton Skull Farms, Ghast Farms, Castles, and even Massive Towers.
This crowd likes to build big things, even within the spawn area. Spawn locations are limited to 20 x 20 lot sizes. If you want to build bigger, such as a 71 block wide Tower, you'll have to go out at least 100 blocks away from spawn.
One not worthy thing to mention is that you should not get on Data's Throne. Serveral times each day, a server announcement pops up to alert players that....getting on Data's Throne will result in Jail time. That is often a 24 hour period of Jail. It never fails, some new players will end up on the Throne and in Jail.
Be sure to read all the rules before you play. Some players are clearly not doing that. Or are at least ignoring them. It should be something you do whenever joining any new server....read the rules. It just might save you a lot of time and hassel.
Also, be nice to other players and respect them. That should be a given. If you're thinking of trolling, you're waisting your time and will be banned.