Mills Lake - Photo by Айрат Хайруллин

Mills Lake is a peaceful lake with amazing views up the gorge towards Longs Peak, Pagoda, and Chiefs Head. The hike up to Mills Lake is a steady uphill walk filled with spectacular views of mountain ridges, rugged peaks, waterfalls and colourful wildflowers. There is a great trail description here -- https://dayhikesneardenver.com/mills-lake-rocky-mountain-national-park/ (Rocky Mountain National Park, Colorado, USA)