Over at Tactical Burger Uprising, I have been running a small 4-slot Minecraft server. I got about 5 players who rotated in and out, and collectively there are some cool things to look at. The server as a whole is about to enter it's third months so it's still a young server. In the future, there will be more evolved versions to come, but for now you can plug this into your single or multiplayer servers and enjoy such sights as Takada's pagoda, Miker's Bakery, CF's .... cave were stuff is kept, and Gumpy's cave of seclusion!
Download is available on the TBU website.