Encased in 3 layers of glass on the sides, 1 layer of glass on top and another layer of air for extra space that can be removed for building onto. This way you can place it underground and not have it flooded with water or lava, and you can remove the glass as necessary to build it into your dungeon.
Building will paste from the S.E. Corner. (in my world it does anyway..)
There are 2 sections, and at least 4 pathways that will take you all the way through.
Paths ways are 2 blocks wide.
The entire building measures 217 X 60 X 8 blocks, so it is big and will take a minute to load.
Built from Minecraft Vanilla 1.7.10 so it will work in anything from that build on up.
Hope you Enjoy!