Douglas Cave

St. Michael's Cave or Old St. Michael's Cave is the name given to a network of limestone caves located within the Upper Rock Nature Reserve in the British Overseas Territory of Gibraltar, at a height of over 300 metres (980 ft) above sea level. According to Alonso Hernández del Portillo, the first historian of Gibraltar, its name is derived from a similar grotto in Monte Gargano near the Sanctuary of Monte Sant'Angelo in Apulia, Italy, where the archangel Michael is said to have appeared.It is the most visited of the more than 150 caves found inside the Rock of Gibraltar, receiving almost 1,000,000 visitors a year.

Leonora's Caves is a limestone cave system in the British Overseas Territory of Gibraltar. They are located within Old St. Michael's Cave.

New St. Michael's Cave, also known as Lower St. Michael's Cave, is a cave system in the British Overseas Territory of Gibraltar. Unlike its namesake, St. Michael's Cave (proper), which has been known for over 2,000 years, this cave was discovered as recently as World War II. The cave was accidentally discovered during World War II, when in 1942 the Royal Engineers were blasting inside the Rock of Gibraltar so as to create an alternate entrance to the lower chambers of St. Michael's Cave, which had been prepared as an emergency hospital. The first sign was when their tunnelling appeared to create no rubble as it had fallen through the newly created opening into this previously undiscovered cave which may have remained sealed for some 20,000 years.The cave's chambers include examples of almost all known cave formations, including a lake nearly 40 yards (37 m) long containing an estimated 45,000 imperial gallons (200,000 L) of crystal-clear water. After the war, the cave and every visitor was supervised by the United Kingdom's Ministry of Defence, specifically the Royal Engineers. It was not until the 1970s that civilian guides were authorised. Within ten years, the guides were all civilians as the Gibraltar Tourist Board took over the cave's management from the military.Three-hour guided tours of the cave can be arranged, ending with viewing the underground lake.

Bray's Cave is a limestone cave in the British Overseas Territory of Gibraltar. The cave has yielded several significant human remains and artifacts from the Neolithic and Bronze Ages. Three almost complete skulls were discovered, along with other cranial fragments from multiple individuals. This suggests that people repeatedly returned to the site to reuse it as a burial ground.

Lord Airey's Shelter is a subterranean military shelter in the British Overseas Territory of Gibraltar. It is located near the southern end of the Upper Rock Nature Reserve, adjacent to Lord Airey's Battery. It was named after the Governor of Gibraltar, General Sir Richard Airey. The tunnel system for the shelter was chosen as the site for the highly classified, Second World War military operation known as Operation Tracer.

Mediterranean Cave is a cave in the British Overseas Territory of Gibraltar.

Mediterranean Steps is a path and nature trail in the British Overseas Territory of Gibraltar. One of the footpaths of Gibraltar, the path is located entirely within the Upper Rock Nature Reserve and was built by the British military but is now used by civilians as a pedestrian route linking Martin's Path to Lord Airey's Battery near the summit of Rock of Gibraltar. The path offers views over the Strait of Gibraltar, Windmill Hill, Europa Point, the Great Sand Dune, Gibraltar's east side beaches, the Mediterranean Sea and the Spanish Costa del Sol.

Hayne's Cave Battery is the remains of two gun positions that made up an artillery battery on the west side of the British Overseas Territory of Gibraltar at Hayne's Cave. Gun emplacements can still be visited at this cave.

Spider Cave is a limestone cave in the British Overseas Territory of Gibraltar. It is located within the Upper Rock Nature Reserve.

The Rock of Gibraltar (from the Arabic name Jabal Ṭāriq جبل طارق) is a monolithic limestone promontory located in the British territory of Gibraltar, near the southwestern tip of Europe on the Iberian Peninsula, and near the entrance to the Mediterranean. It is 426 m (1,398 ft) high. Most of the Rock's upper area is covered by a nature reserve, which is home to around 300 Barbary macaques. These macaques, as well as a labyrinthine network of tunnels, attract many tourists each year. The Rock of Gibraltar, one of the two traditional Pillars of Hercules, was known to the Romans as Mons Calpe, the other pillar being Mons Abila, either Monte Hacho or Jebel Musa on the African side of the Strait. According to ancient myths fostered by the Greeks and the Phoenicians, and later perpetuated by the Romans, the two points marked the limit to the known world, although the Phoenicians had actually sailed beyond this point into the Atlantic, both northward and southward.The Mediterranean Sea surrounds Gibraltar.

Rooke Battery is a now derelict artillery battery on the west side of the British Overseas Territory of Gibraltar.

O'Hara's Battery is an artillery battery in the British Overseas Territory of Gibraltar. It is located at the highest point of the Rock of Gibraltar, near the southern end of the Upper Rock Nature Reserve, in close proximity to Lord Airey's Battery. It was constructed in 1890 at the former site of a watchtower that had earned the name O'Hara's Folly. The battery and tower were both named after the Governor of Gibraltar Charles O'Hara. The first gun mounted on the battery was a 6-inch breech loading gun, which was replaced with a 9.2 inch Mark X BL gun in 1901. The battery was in use during World War II and was last fired during training exercises in 1976. O'Hara's Battery has been refurbished and is open to the public. The battery and its associated works are listed with the Gibraltar Heritage Trust.