The Carriage Ride to the Forge
Note that Wayne sleeping here is a side effect of him getting really sickly for a short time, trying to recover a bit of healing power. Marasi thinks he's just relaxed, which . . . well, he kind of is, but he wouldn't be sleeping right now save for the effects of his Feruchemy.
As another side note, the city really is as miraculous as Marasi thinks to herself. Sazed created an Eden-esque little section of land here, a place of extreme bounty and fertility, in order to cradle the regrowth of mankind. The actual science (such that it is) of it has to do with the mists bringing fresh water and hugging the ground extra strongly here, as well as some molds that refertilize the ground.
Marewill flowers are named after Kelsier's wife. (Spook, the Lord Mistborn, came up with the name—as well as naming a lot of the things that held out until this time, such as the months of the year.) The other little worldbuilding item of note here is the idea of what Wayne calls the "God Beyond," which is an idea that has begun to creep into society, the idea that there is a greater God of the universe beyond people like Harmony or Kelsier. It's somewhat analogous to some of the Gnostic beliefs in early Christianity.