O'Hara's Battery

O'Hara's Tower was a watchtower in the British Overseas Territory of Gibraltar. It was located at the highest point of the Rock of Gibraltar, at what is now O'Hara's Battery, near the southern end of the Upper Rock Nature Reserve. Initially known as St. George's Tower, it was constructed in the late 18th century on the order of then Lieutenant Governor Charles O'Hara, under the presumption that it would be useful in observing the enemy at the Port of Cadiz. Not only was it unsuccessful; it was struck by lightning shortly after it was built, and remained in ruins for much of the 19th century until its demolition in 1888. Formerly referred to as St. George's Tower, it came to be known as O'Hara's Tower or, frequently, O'Hara's Folly.

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.

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.

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.

The Goat's Hair Twin Caves are in the British Overseas Territory of Gibraltar.

Spur Battery is an artillery battery in the British Overseas Territory of Gibraltar. It is located in the Upper Battery area of the southern end of the Upper Rock Nature Reserve, just southwest of O'Hara's Battery. A 9.2-inch Mark X breech-loading gun was mounted on the emplacement in 1902, with improvements made to the battery after World War I. In 1981 the 9.2-inch gun at Spur Battery was dismantled and transferred to the Imperial War Museum in Duxford, England, for preservation. The operation was known as Project Vitello.

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

Martin's Cave is a cave in the British Overseas Territory of Gibraltar. It opens on the eastern cliffs of the Rock of Gibraltar, below its summit at O'Hara's Battery. It is an ancient sea cave, though it is now located over 700 feet (210 m) above the shore of the Mediterranean Sea. It is only accessible because Martin's Path was constructed.

Fig Tree Cave is a cave in the British Overseas Territory of Gibraltar. It is located on the eastern cliffs of the Rock of Gibraltar, not far from Martin's Cave within the Upper Rock Nature Reserve.

George's Bottom Cave is a cave in the British Overseas Territory of Gibraltar. This together with Tina's Fissure and Levant Cave are a close group of three caves at the southern end of the Upper Rock Nature Reserve.The existence of George's Bottom Cave was suspected on 27 November 1965 when the Gibraltar Cave Research Group found a small hole in the Rock of Gibraltar near Spur Battery, 310 metres (1,020 ft) above sea level. As the group could feel a draught from this hole they suspected it was the entrance to a cave and they arranged to have a large boulder moved to reveal a larger but still small entrance. The cave was named after George Palao of the Gibraltar Museum. Having entered the cave, visitors find that the passage is tight, which necessitates crawling at some points. Crawling in is made no easier by the cave coral which together with the curtains, columns, straws, and helictites create a variety of limestone formations. However, the cave has six different levels which contain a wide variety of formations in numerous chambers and fissures.

Dudley Ward Way is a road tunnel through the south-eastern part of the Rock of Gibraltar. It is named after Sir Alfred Dudley Ward, Governor of Gibraltar from 8 June 1962 to 5 August 1965. The road running through the tunnel links the eastern side of The Rock (including Catalan Bay and Sandy Bay) via Sir Herbert Miles Road, with Europa Point, at the southern tip of Gibraltar via Europa Advance Road.

AROW Street is a tunnel in Gibraltar that was excavated in 1942. The tunnel, like Gibraltar's Great North Road, was large enough to take Army ammunition trucks.