Megastructures are enormous and extremely expensive structures for enhancing your colony. Both megastructures are massive, with a 4x4 footprint and require lots of workers. The return is an extreme increase in morale.
List of buildings
|Earth history center||420||72||21||+36 Entertainment morale|
|Stadium||450||90||21||+36 Entertainment morale|
|Space elevator||900||44||21||Greatly increases storage and accelerates colonist travel to and from the colony ship|