This is Lapis Island, an experiment map in .mctemplate format. This will import it as a world template so you can make a new world using it any time.
It is based on command blocks, so it doesn’t really take you into a new dimension. Instead, it teleports you high into the sky onto a floating island made of lapis lazuli blocks and a house with a chest full of DIAMONDS. A bed even though you don’t need it because of Always Day but if you configure the world differently you may want it.
I hope you enjoy!
Epic Chas Gamer 😎