"archaeological_site"=>"tumulus","historic:civilization"=>"prehistoric"
"archaeological_site"=>"megalith","heritage"=>"2","megalith_type"=>"dolmen","ref"=>"D30","wikidata"=>"Q2406248"
"archaeological_site"=>"megalith","megalith_type"=>"dolmen","ref"=>"D29","wikidata"=>"Q3136307"
"archaeological_site"=>"megalith","megalith_type"=>"dolmen","ref"=>"D28","wikidata"=>"Q2326552"
"archaeological_site"=>"megalith","megalith_type"=>"dolmen","ref"=>"D27","wikidata"=>"Q2688481"