casmilo caves valley, coimbra, portugal. landscape at casmilo caves valley in coimbra, portugal

ancient archeology autumn big bright brook buracas casmilo caves cave cavern coimbra condeixa nova condeixaanova condeixanova dark destination earth entrance environment europe exploration explorer geologic geological ground hole holes huge landscape mountains mystery natural nature old outdoor portugal rock serenity shelter sky stone structure sun texture tour tourism tourist travel valley view visit wall portugal