While backpacking in West Virginia, @yumyumseth and I camped by little stream/river. I kept walking upstream finding little "waterfalls" and taking long exposures, for what felt like a long time. Here's one of my favorite shots, taken with a 24mm as low as I could go with my tripod.
Canon 6d, Rokinon 24mm f/1.4. // Cranberry Wilderness, WV USA