A dome on a town

3 questions totally (or maybe not) stupid. I want to create a dome on top of a town. This dome is made with a shield.
First I tried to use Skybox but the result was not interesting. In addition, I cannot put the textures in tiles so the textures of ‘sky’ for Skybox are very ugly and pixelized. Maybe I jumped one step or missed something.

Then, I made a dome. It means a sphere with texture and a collider. Then put the sphere on top of the town. Catastrophe ! No texture. With POV Ray, it was the best method to get a sky. But with Unity, the textures seems to be applied on the outside, the surface of the shape not in the inside. How can I get an external texture visible from the inside of the sphere.
Final point, can I apply on a ‘dome’ (whatever the methode used) a particle system ? So that I get a ‘shiny’ dome ?

Thank a lot in advance.

To have the texture displayed on the opposite side (the inside) of the dome simply flip the normals of the dome in your 3D editing software.