During our cruise to Alaska this summer, I took a tour hosted by a local photographer. As I was still new to DSLRs, I got a lot of good tips about lens, exposure, and composition. One of our stops (between looking for grizzlies)was in front of someone's house - where the guy collects and stacks rocks, without any glue or reshaping. Looked like hundreds of mini-stonehenges. I was almost afraid to walk around, fearing to bump one & never be able to balance the tower again!