Press '~' to bring up the console and enter these codes:

archive level : \map archive
boat level: \map boat
bunker level: \map bunker
carrier level: \map carrier
catacombs level: \map catacombs
control level: \map control
cooler level: \map cooler
dam level: \map dam
factory level: \map factory
fort level: \map fort
pier level: \map pier
rebellion level: \map rebellion
regulator level: \map regulator
research level: \map research
river level: \map river
steam level: \map steam
swamp level: \map swamp
training level: \map training
treehouse level: \map treehouse
volcano level: \map volcano