travel by karst places 2

1500m altitude and architecture area attraction attractions bucegi calcareous can carst cave caves cavespecific caving cliffs deep depth europe exploration explorer exterior formations galleries geographic geology gorges grotto halls holes huge ialomicioara ialomicioarei ialomita ialomoicioara impression impressive interior karst keys limestone located minerals mountainsn mysterious natural nature occasion petrography photographer picturesque pillars places reliefsn right rocks romania sediments see slope stalactites stalagmites structure through tourism tourists travel tunnel underground used vaults walls