The Eternal City

The capital, and the only place in the world a human would recognize as a city. It is grown as much as built — a vast spiraling structure of fused stem, resin, and dew-glass rising out of the meadow, catching the light so brilliantly that on clear days it can be seen from the borders of three provinces.

The Queen's court occupies the upper spires, which only the winged can reach. This is presented as ceremony rather than as the exclusion it plainly is.

The Ring

Around the city runs the Ring: a belt of High Sidhe estates, each held by a noble house, each competing to be the most beautiful and the most humanlike. The Ring's gardens are the most exquisite and most artificial landscapes in the world, grown at ruinous expense in soil hauled in from the provinces — the nobility have paved over the Heartland in order to build imitations of the Heartland.

The Underfoot

Beneath and between all of it are the service warrens where the capital's non-Faerie population actually lives. Ants, beetles, spiders, silkworms, and the occasional hobgoblin keep the Eternal City fed, clean, and lit, and are expected to be invisible while doing it. They appear in no census; the 90,000 figure is an estimate by a Leprechaun surveyor who was not asked to produce it.

More conspiracies are hatched in the Underfoot in a season than in the Outer Wilds in a decade.

Relations

Everything answers here. Whether the Queen is a High Sidhe herself, or something above that tier reserved for her alone, is the one theological question the court permits to remain open.