So, last Friday I heard about the Bone Caves, and knew with a name like that I had to visit. It's a collection of caves near the village of Elphin, in the north of Scotland. It (originally) had lots of bones - polar bear, reindeer and others. It's reckoned there's 2 miles of caves, but my crappy phone torch and claustrophobia meant I managed around 2 meters exploration.
Reminded me of my favourite Thief mission - Down in the Bonehoard, but without the zombies...