I have never been to US national park, but I&#x27;ve visited some in Eastern Europe and Scotland. I can&#x27;t imagine myself traveling over 4 thousand miles by any other transportation (trains, buses, bicycles, walking) within given timeframe, budget and convenience. Now this is the &quot;old world&quot;, where you travel 500 miles and find yourself in an another country; I can only imagine what traveling in the US feels like. Maybe, one day, I will know - one can always hope...