I am going to post things about the world of Mars here soon. There are more than 10 public building worlds and I will try to do a separate page for each that I have built on.
Some Object Yards (OY) that I’ve found the coords for are listed below, be careful where you click when objects are loading:
mars 879s 777e
mars 1494.86S 520.97E 0.00a 48