[Fantasy] How to write Dungeon-crawling.

Do you write temple exploration scenes?

I'm attempting that at the moment, and it's difficult. How do you do so without making it monotonous? Constant mini-skirmishes, or cuts to external action and unrelated passages?

Somewhat connected: do you create your own conreligions as well? Which real life belief systems promote your creativity the most? Or do you take inspiration from other works of fiction?

Personally, I'm creating my own interpretation of Discordianism, adding a few Lovecraftian elements, and adapting that into the temple's architecture.