kropfenstein castle or ruine der burg kropfenstein oder höhlenburg kropfenstein casti grotta or ruina grotta, waltensburg

ancient architecture attraction autumn blue building burg canton casti castle clouds construction der europe european exterior forest fortress graubünden green grisons grotta hill historic historical history kanton kropfenstein landmark landscape medieval mountain mountains nature oder old outdoor river rock romantic ruin ruina ruine scene scenery scenic schweiz sky stone summer swiss switzerland tourism tower travel tree trees trip valley view village wall waltensburg wanderlust