Part of the Upper Rock and one of Gibraltar's 150-some caves, St. Michael's was used by Neanderthals as far back as 40,000 BCE; was later known to the ancient Phoenicians, Greeks, and Romans; and is thought to have been used by the Arab invaders of Iberia in 711. Originally named San Miguel by the Spaniards, under British rule it's recorded as having been a venue for picnics, parties, concerts, weddings, and even duels. These days this tradition has been carried on since the 1960s, with its largest chamber, the Cathedral Cave, serving as an auditorium with seating for more than 100, a regular program of performances - and of course amazing acoustics.

It's also one of Gib's top attractions, with more than a million visitors annually, who come to see its impressive stalactites and stalagmites colorfully illuminated, and to learn about the cave's history from the displays throughout.

Mike McBey