A large gothic mind-messing open fo...

A large gothic mind-messing open fortress on a jagged black stone coastline floating island. i want to use psychedelic/LSD themed colors for the entire fortress building and surrounding area. The entire structure should look ancient, towering, and have a mythical style with open structures that have the insides designed and made to be a big room with designs. there should be 3 main big triangular buildings and other spiritual structures or designs on the floating island and make the actual island floor made of only natural blocks