mira de aire caves, grutas de mira de aire at leiria, portugal. a set of limestone caves in porto de mos

portugal cave grutas mira aire rock limestone underground travel nature water dark adventure tourism landscape view yellow mountain grotto stalagmite cavern stalactite speleology stone geology tunnel natural light outdoor geological destination beauty stones color europe landmark archeology subterranean historical antique excavation paradisal littoral carvoeiro porto mos leiria moinhos velhos caves portugal set leiria