colorful and dark texture inside the lapa de santa margarida cave in the arrábida, setúbal portugal

colorful dark texture inside lapa santa margarida cave arrábida setúbal portugal geological formation mountain range activity adventure arrabida black cave cavern colorful colors dark darkness deep design destination europe exploration formation geologic geological geology grotto hiking history illuminated inside interior lapa lowlight mineral mysterious mystical natural nature park passage pattern portugal portuguese range reserve rocks saint margaret margarida serra sesimbra setubal stone texture textured travel undergrounds