This is the domain where Death resides.
The first thing visitors notice is that the Domain is black. Everything in Death's Domain is either black, or bone white. Splitting darkness with an eight-sided prism produces different colours of black. He has black peacocks with skull-shaped patterns on their tails, bees, plants and trout. They are all 'alive', as far as they can be in a place where time does not pass.
Everything in his garden is a copy of something he has seen elsewhere, since Death cannot create. Things that stand out are a swing that he built from scratch, with his own hands, for Nicole, his daughter (with some distinct flaws in its design to allow it to actually 'swing'), the cats, which come and go into the Domain as they please and vary in colour (Death likes cats), and the wheat field, which is golden, and ripples in the wind (despite the fact that there is no wind). There are also distant mountains, and stars, which have questionable reality.
The Domain gardens also include a hedge maze and a golf course. Since Death finds it impossible to get lost, nor has any difficulty hitting a sphere so it goes exactly where he wants, he doesn't really see the point of these, but they are part of his efforts to be more human. He even has an umbrella stand by the door (despite the fact that it never rains in the Domain, but you have to put your scythe somewhere).
To one side of the Domain is the Well of Souls, which spirits briefly pass through on their way to wherever they think they're going. If one listens, they can hear the last words of souls as they enter.
At the centre of the Domain is Death's house. It is called "Mon Repos", ("my place of rest"). It looks like a fairly average manor, apart from being black and bone-white and having an omega door knocker. Inside, however, it is of an infinite size, which can be crossed in an hour or an instant, because Death has not quite mastered the art of scale. Most humans who have stayed in the Domain can only deal with the size of the rooms by ignoring them, and staying on small patches of carpet surrounded by immensity. Although the interior maintains the black-on-black, skull-and-scythe motif it is, like its outside, somewhat ordinary and average in its design. Some assume that Death's house would look like a mausoleum or a crypt, but in fact Death knows very little of cemeteries, as very few people actually die in them.
Any clocks brought into Death's Domain get depressed and stop working. The only working clock is the special grandfather in the hall with a scythe for a pendulum. The 'minute' hand takes thousands of years to go around. The 'hour' hand will only go around once.
He also has a bathroom (Never used by him, but by his butler, Albert) with a bar of bone-white, rock-hard soap, a towel rack with one real towel, owned by Albert (the other towels are as hard as the rack, and attached to the rack, because Death doesn't get an idea of basic towel-ness, among other things).
As well as the 'ordinary' rooms, maintained for appearance and the benefit of Albert, the Domain contains the life-timer room, where the sands of everyone's lives drain away. Adjacent to the life-timer room, there is another room in which the life-timers of the immortals rest. And there is the Library, where everyone's "autobiography" is being written by itself. Both of these rooms are even more conceptual and arbitrary in dimension than the rest of the Domain, and the clearest example of its status as a refined metaphor.
Death spends a lot of his, well, time would be the wrong word, but down-time in the domain, often reading in the library, perhaps looking up the location of a shipwreck that's about to occur, or perhaps developing the latest obsession he picked up from humanity. He welcomes visitors, so long as they are not on the list, as long as they have the courtesy to knock on the front door and wait for Albert to see him in.