Great Siege Tunnels - Credit: Wikimedia Commons
Great Siege Tunnels - Credit: Wikimedia Commons
The Great Siege Tunnels in the British Overseas Territory of Gibraltar, also known as the Upper Galleries, are a series of tunnels inside the northern end of the Rock of Gibraltar. They were dug out from the solid limestone by the British during the Great Siege of Gibraltar of the late 18th century. Read more on Wikipedia
Source: en.wikipedia.org