In Fall 2018, The Mars Society offered a prize for the best design and description of a 1000 person colony on Mars. The twenty page plans had to account for the colony location and design, the economic success of thecolony, the socio/cultural environment, the governance processes, and the aesthetics of living on Mars. One hundred teams from around the world responded with their proposals. This book presents 22 of the plans judged to be the best to address all these requirements in a comprehensive way. The depth and breadth of this thinking of teams from around the planet Earth as they planned and described their concepts for settling the Red Planet can only be fully appreciated by reading all of the design reports in this book.