Crypt / Склеп — a grim stone structure for gargoyles; the manual indicates that Gargoyle is recruited through the Crypt.
Nest / Гнездо — a rocky nest for griffins.
Maze / Лабиринт — a convoluted structure for minotaurs; Minotaur is recruited from the Maze.
Swamp / Болото — a dark bog for hydras; Hydra is recruited through the Swamp.
Dragon Tower / Башня драконов — the main building, a dark tall tower for green/red/black dragons.
Dungeon / Подземелье — a special structure that looks like a source of dark wealth and power.