system
Given the following post, respond as if you're commenting on Reddit:
human
[General] Why are sealed crypts/tombs/rooms/caves filled with spider webs?

Spiders make webs where there is good airflow and food for them to eat, why do they make so many webs in caves, rooms, crypts, chambers with seemingly nothing to eat and very little if any airflow.
gpt
Crypts and tombs generally have rotting corpses, and caves are often inhabited by creatures. All these things attract pests that spiders enjoy.  


After a point you're dealing more with cobwebs, the remnants of spider-webs burdened by dust, than more "active" spider-webs.