Ryo's Lab was actually in two places. The first was inside Sentai Fortress, but it was abandoned for security reasons after the Striking Venom Attack. Its function was reestablished in the Golden City.
Ryo's First Lab
And many modifications to existing battle machines.
|Northern Half:||Sentai Fortress (Ryo's Labs) (Sentai Village) (Sentai Gate) | Sentai Golden City (Golden Tower) (Nightmare Lab) | Abandoned Village (Generator Room)|
|Southern Half:||Robot Fortress (Robot Construction Labs)|
|Both Halves:||Bridges (Tenchi) (Mechara) (Cyrid) (Goldstone) | Gates (Sentai Gate) | Mines|
|Other Places:||The Gorge | Deep Jungle | Fields|