The Gibraltar Nature Reserve, also known as the Upper Rock, is a highlight of visiting Gibraltar, offering a blend of natural beauty and historical significance. Home to the famous Barbary macaques, it also features stunning views, impressive caves (like St. Michael's Cave), and military heritage sites. Accessibility within the reserve varies; some areas are easily accessible, while others involve steep climbs. Guided tours are available and can enhance the experience, providing insights into the history and wildlife, though solo exploration is also popular. Seasonal considerations are important, as the heat in summer can be intense. The approximate cost for entry is around £13 per adult, and a typical visit duration ranges from 3 to 5 hours, depending on how much you want to explore. Consider comfortable shoes and plenty of water.