There is a shock to your system that comes from seeing natural wonders. Maybe you know it. Your chest constricts in a good, excited way. You grin. You can’t tear your gaze away. It’s as if your eyes know that this is something extra special, and they need to lock on as long as they can, soak everything in before you’re gone again. And even when you do return, the feeling is the same. Some things are, happily, hard to get used to. It was our “rest day,” though it turned out to be more adventurous than restful. No matter! After breakfast we gathered our day packs and began the two-hour hike to the electrichka train station. We were going to the shores of Lake…