Hi Guys,
I would like to present you my first project. It is a 531W x 874L x 256H Map that was first processed in survival mode. The complete Flat Area was mined by me in survival (leftovers can be found in the Sea "House" => I never completed it).

After a few Weeks I noticed the Huge cave System under the Area and thought it would be a great PvP Map for me and my Brother. That was when I started to turn the whole map inside out. I went in Creative Mode, marked the caves, build up a railway system nearly everywhere and some very cool secret passages too.

Now my work is finished (except for the Sea House). It is a mixture of a Minecart, Piston, Redstone Device, Underground-/Airstructure Map!

Some usefull Hints:

1. I am German, so every sign is in German too.
'Sie befinden sich bei xxx' means 'You are at xxx'
' Nach unten/Nach oben in Richtung xxx' means 'Downwards/Upwards to xxx'
'Lila Flachland' means 'pink Flatland'
'Quallenplattform' means 'Jellyfishplatform' => Fun Fact: It was used to be a Skull (yes I am bad at Arts), then I made a Jellyfish from Spongebob out of it
The signs where you read 'da' are not German. It was a simple Mark for me that the cage ends or is not usable for a railway.

2. I used concrete to Mark some railway tracks. So you have to use minecraft Version 1.12? at least!
Blue = Water,
Green = Circulation,
Red = Conncection between two or more Circulations
Magenta = One Cave system (you can not see lonely cave systems, because i connected them)
Orange = Cage Dead End

3. There are MANY Secret passages, exits, traps etc. EVERYWHERE. I Will give hints in the pictures, but won't show every secret. Maybe you work together and write Coordinates in the Comments?

4. The Map is great for Flans Mod use! If you do not jump of in the railway systems you can go everywhere and have a lots of fun! The Flat Area is great for Tanks and Jets/Planes, the Ice Tower for Sniping, and the Forest for hiding or running away while reloading. I Have also a Flans Mod ready Map (with a spawnpoint, command Blocks for keeping inventory, daycylce etc. and Chests full of Weapons => Just write to me an I will send you the map)

5 .Every Cage entry except the railway entries does not go deep into the earth/into another cage system. Some of them are Connected (often in the flat area) so that you come up again a few blocks away or just have a Dead end and can be used for hiding.

6. Although the map might be a bit too huge for PvP/Flans mod every Point can be reached within 2 minutes by railway. If you talk together where you are, or just play on one side/one Land (iceland, forest, Lea) of the Map it is very funny!

7. It is nearly impossible to destroy the Redstone devices by spamming etc. Just dont press two buttons at once!

8. Be sure to wear anti Fall damage (i don't know the word in english) armor before you use the Jellyfish Railway!

9. The Command Blocks in the house are recommended! Night vision is usefull in the reailway caves and mob spawn is deactivated so you can turn the difficulty up too.

Just give it a try! Have Fun!