Spain’s Underground [google_map_easy id=”44″] Location: Madrid Spain Functions: Unknown Levels: Unknown Tunnels to: Unknown Notes: Underground tunnel system discovered that was used by Franciscan Monks. Source: http://www.angelfire.com/ut/branton/Spain.html Location: Rota Cádiz Spain Functions: Unknown Levels: Unknown Tunnels to: Unknown Notes: A couple visiting Spain was shown the entrance to an amazing underground city on some private property in the countryside. Source: Location: Spain Functions: Unknown Levels: Unknown Tunnels to: Unknown Notes: Source: