Things that that belong to no district:
The Central Plaza
-The Central Plaza has inlaid tiles that are detailed to look like a stylized map of the city. Blue-grey tiles to mark out the streets (a la the map) and round blue-white tiles to mark the towers. At the center of this map, where the center plaza would BE on the map, was once a 20 foot wide glass lens.
While the glass lens still existed, through it one could see stars and pick up on a strange aura surrounding the area. There were half-whispers there of something and an odd sense of vertigo, as if there were infinite possibilities pressing in from all sides.
Underneath that section of the city is the Heart of Nautilus, and the Gate to The Labyrinth.
After Soundwave shattered the lens and was pulled beneath into The Labyrinth along with Edward Elric, Antovil went in to retrieve them. Upon his successful return, Antovil, now the Deva of Direction, changed himself into a lighthouse to sit over the Heart and the entrance into the Labyrinth to prevent anyone else from accidentally or intentionally ending up within the Chaos below. Antovil's watch was briefly interrupted a few months later when the living embodiment of the Labyrinth erupted forth from the gate below and fled into the shadows of the city.
Shadow Nautilus
-If you have a Persona, then you can enter Shadow Nautilus through any television screen. It's exactly like Nautilus was during the Shadow Event, filled with fog and shadows and all of the dungeons previously erected for the duration of the reality storm. If you don't have a Persona, then you can't enter this world, nor can you leave it, unless someone with a Persona guides you in or out. Characters without a Persona can use this as a means of facing their Shadow self and getting a Persona of their own. But you'll still need to be able to Bend the ability in order to keep it permanently.
Things that are present in ALL districts:
- The Gates: There are two in each district. They are medieval double doors, twenty feet wide and thirty feet tall. Despite this, they are pretty easy to open, and are mostly big and white. Each one has, in the arch above them, the symbol of whatever district you're in. The surfaces are patterned in abstract patterns that also relate to the district, and they seem like they're made of ivory or alabaster.
- There is a train that runs through all the districts and will make stops as appropriate. If one steps into the third cart down, they might find… some random bones. Creepy.
- The train has been transformed to look like the Flying Pussyfoot from Baccano!. Interior here.
- The train had been taken apart down to its tiniest of pieces by Graham Specter. Garrus Vakarian had put some of the smaller parts back together, but it otherwise remained in pieces until June, when Kaylee Frye repaired the train back to its prior state. It is now functioning again.
- Underneath all of Nautilus, there is a Tunnel System. More information here.
- There are fireflies throughout the city, though they tend to congregate around green areas; this includes Not!Virginia in the South. The fireflies are also in unusual colors – in addition to the usual yellow, there are red, blue, green, orange, and violet fireflies. Note that the cooler colors like to fly higher up in the air.
- A bunch of road signs are in each district, all pointing towards the Eastern district, towards the Manhattan area, saying "This way to New York City."
- Haystacks can be found all around the city, in wood carts and just precariously laying there. If they're moved or otherwise destroyed, they just reappear the next day.
- Pigeon coops can be found on the rooftops; one in each district.
- In each district plaza, there is an array engraved into the ground. Although the Elrics made a Network announcement, they made sure to leave instructions on how to use them. Just in case. (The signboards are located near each.)
