the incredible earth pyramids of collepietra (piramidi di terra) in the dolomites

collepietra italy trentino alto adige earth pyramids bolzano striking sculpture wood handheld gravel marvelous spring day sunny afternoon dirt amazing outdoor magical beauty magnificent puster valley sightseeing mountains column pillars stone scenic nature famous ecological monument formation tourism landscape travel pyramid erosion tyrol ritten natural dolomites europe mountain rock renon geology phenomenon alps