How should i modell a Cave

Zurichasfg

Hello,

I want to create an big cave the problem with that i never modeled a Cave and have no clue how to model one. On Youtube there aren't much help especially for Maya User.. Maybe you know how to model one it would be so much much appreciated
I want to model a cave similair to this Concept Art:

I appreciate every answer and help.

gnoop

Make a polygonal bubble, sculpt it to shape you want , invert normals,   model or get few photogrammetry scanned  rocks with lods , scatter them as instances on surface of that bubble , model and add columns with lods , insert road polugonal stripe  or construct it from a repeating mesh block , scatter  smaller things along roadsides to hide repeating, make repeating blocks of your castle  and build it from them , put lots of decals around.