MCBloodlines is a brand new hardcore SMP that is trying to feel like those Minecraft civilization videos but it is open all the time.
It is invite only and only people who are already in can invite new players. That makes the community grow in a more natural way and it helps keep trolls out.
There are secret tweaks and mechanics too. You do not get guides so you have to discover how stuff works by playing and paying attention.
The server also has a clan and family system so you are not just alone when you start. You join because someone invited you and you become part of their group and the bigger story.
