Undertaker's Lair
Where he works, and accommodates his guests. Preparing them, comfortably, for their eternal slumber. By intricate detail he makes their final bedding in compliment to their body, and their memory.
The building is also his home, in which he sleeps, eats, invites his more lively guests, and learns. It is his interest to take from each guest what he can in order to learn more about them-- a pathologist to be exact, for sake of title. By each guest he is given an opportunity to learn more, even the ones with a heartbeat he tries to take interest in what they have to offer.
The content of his surrounding field.