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

museum pile dwelling pile lake dwellings friedrichshafen germany lake constance open air museum unesco pfahlbau museum bodensee historical site unesco world heritage sunken village wooden structures bodensee unteruhldingen building visit neolithic era bronze age reconstruction tourist pfahlbau cultural heritage prehistoric educational institution 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