St. Michael's Cave in Gibraltar is a network of limestone caves offering a glimpse into the geological history and legends of the Rock. The Upper St. Michael's Cave is the most visited section, featuring impressive stalactites and stalagmites, and is sometimes used as an auditorium. Accessibility is generally good, but some areas may involve stairs. Solo visits are common and feasible, but guided tours can provide more in-depth information about the cave's history and formations. There are generally no seasonal restrictions, but it's wise to check for event closures. The cost of entry is typically included with the Gibraltar Nature Reserve ticket, which covers other attractions on the Rock. A typical visit duration is around 1-2 hours, depending on your level of interest.