I made some redstone contraptions and i also assembled some that mr.crayfish posted and there is a massive tnt cannon i didnt make but other than that i hope you enjoy.

The Island, from the TV show Lost.

I copyed the Area of the Underwater Temple and past it on air.
Then I removed the water inside and outside the Temple.
Now ou can see how it look likes!

I have created a massive dome with a huge city inside of it, just like in the Truman Show! Check it out!