Finally got around to exploring the abandoned 18 Arhats Cave in Keelung. The tunnel system is surprisingly extensive and labyrinthine, and conditions inside were not too bad despite the passage of decades. Still have to dig into the origins of this place; was it a military bunker?

If you've ever played one of those dungeon crawler games from the 80s/90s, the experience of heading into these tunnels was eerily similar, especially with all the 90-degree turns. It would be interesting to see a map of the place... might have to break out the grid paper for a return visit.