Salt Cathedral of Zipaquirá
The Salt Cathedral of Zipaquirá (Spanish: Catedral de Sal de Zipaquirá) is an underground Roman Catholic church built within the tunnels of a salt mine 200 metres (660 ft) underground in a halite mountain near the city of Zipaquirá, in Cundinamarca, Colombia. It is a tourist destination and place of pilgrimage in the country.
Source: Wikipedia — Salt Cathedral of Zipaquirá (CC BY-SA 4.0)