Catacombs are tunnels of the dead beneath a living city, so they are read as the past and the ancestors carried underneath daily life. Walking through them stands for exploring old memories with care.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.