Boggy Ben's Lair is a dome-shaped dilapidated building located in the middle of the Swamp of Boggy Ben. It is the home of the monstrous Boggy Ben. Inside the lair, there are numerous cages hanging from the roof. These are most likely used to hold Ben's victims.
The lair was eventually destroyed completely during Boggy Ben's battle with the ThunderCats, especially because of the ThunderTank crashing into it.