entrance of a cave river with a small waterfall into an underground cave

adventure ancient awe big bizarre canyon cascade cave cavern caving cliff color countryside creek darkness deep destination earth energy exploration explore flow flowing geologic geological geology glacial grotto hole impressive landmark landscape light limestone majestic mineral mountain mysterious natural nature nobody old outdoor outdoors panoramic peaceful river rock rocks romantic scenic sinks spelunking stone stream summer sunlight tourism travel tunnel underground underworld unique vacation vibrant view vivid water waterfall wild wilderness wonders wyoming