Damage towers

Archer Tower
Ballista
Cannon Tower
Crystal Howitzer
Dark Flak Tower
Drakul Pylon
Earth Flak Tower
Electro-Flak Tower
Fire Flak Tower
Fire Turret
Ice Flak Tower
Ice Turret
Lightning Tower
Storm Tower
Trebuchet

Perches

Seagazer Perch (first)
Riverwatch Perch (second)
Stonespear Perch (third)

Mages

Blue Mage Tower
Red Mage Tower

Totems

Dark Totem
Earth Totem
Fire Totem
Ice Totem
Wind Totem

Home island

Breeding Castle
Builder Hut
Dragons Den
Egg Incubator
Forge
Hall of Research
Storage Hut

Farms

Lumber Mill
Sheep Farm