Engineering, the fourth Construction <l:6,66>Advance<e>, introduces the arch and cement to building, resulting in such happiness improvements such as the <l:2,13>Coliseum<e>. In addition, it allows for the knowledge necessary to construct the mighty <l:1,74>Siege Engine<e>.  Finally, Engineering allows a city to construct <l:6,117>Infrastructure<e> by devoting its resources to creating public works.
