Here's a fun idea:
Get a few maze builders together and make an absolutely massive maze, chunk by chunk. Kind of like the longcat collages, but a maze, not a longcat.
Each chunk will be, say 151 x 151 x 3 and have a single entrance and exit, on opposite sides, so it goes on forever into the distance. With a standardized design scheme it should grow seemlessly into the horizon.
I'm new here so is it possible for a new world to be created for this, if the critical mass of interest is achieved? Recruit level and up seems appropriate.