Unesco Heritage Site Pile Dwelling Open Air Museum on Lake Constance in Friedrichshafen, Germany

museum pile dwelling germany open air museum lake constance unesco pfahlbau museum bodensee unesco world heritage pile building sunken village wooden structures bodensee unteruhldingen friedrichshafen lake dwellings visit neolithic era bronze age reconstruction tourist pfahlbau cultural heritage prehistoric educational institution historical site outdoor exhibition conservation museum exhibits ice age archaeology environmental preservation cultural tourism heritage site living history waterfront settlement tourist attraction visitor center historical interpretation preservation efforts lake dwellers historical reconstruction exhibition space conservation methods sustainable tourism archaeological site management neolithic stone age travel