There are over 150 caves in the Rock of Gibraltar. The Romans considered the largest one to be bottomless while the Greeks believed it was the entry to the underworld Gates of Hades. Come see why over one million people visit St. Michael’s Cave each year. This limestone network of caravans is filled with incredible stalactites and stalagmites. Their dramatic shapes are enhanced by a light show in the Cathedral Cave since it was converted into an auditorium. This is also a concert venue with a seating capacity for 600 people.