sandstone menhir with mysterious inscribed s, dating from 6000-4500 bc, in the dry hills near vale fuzeiros, algarve,

sky ancient trail prehistory monument history dolmen scrubland magical menhir symbol scrub grey mysterious mystery portugal view historic prehistoric algarve spiritual travel nature art landscape mountain blue red old stone sandstone geology tourism beautiful outdoor europe hiking spirituality rock mediterranean inscribed symbols dating 60004500 dry hills vale fuzeiros