The main reason why i find this a fun build, especially for servers, is because although it takes quite a long time, it's an ideal candidate for a team project and can then be modified to act as a multi purpose building.
![](http://3.bp.blogspot.com/-KCgLLfgwmjw/TtIvtDMvHkI/AAAAAAAAACc/sPCVUBbCB6A/s400/pyramid+sign.png)
For example, as you can see i have turned this pyramid into a passive mob farm. This can be done by simply lighting the interior. You should also make sure that the pyramid is built in a biome that allows for spawning . This one won't work due to it being in a snow biome,
![](http://2.bp.blogspot.com/-rtkh3XDisbg/TtIw9DYeryI/AAAAAAAAACk/DajOf5F9VZA/s400/pyramid+interior.png)