Edinburgh Castle sits on an extinct volcano that last erupted over 340 million years ago. This formidable defensive position on what is known as Castle Rock is a volcanic plug, formed when magma hardened within a vent of the ancient volcano. This geological foundation has made it a strategic stronghold for over a thousand years, shaping the history of Scotland from its very core.
Historical & Geological Facts
The castle's story is as dramatic as its location. It's a place of royal births, daring sieges, and military tradition, with secrets held deep within its stone walls.
1. It’s built on a 340-million-year-old volcano
The castle stands proudly on 'Castle Rock,' the plug of a volcano that erupted millions of years ago. Glacial erosion during subsequent ice ages wore away the softer surrounding rock, leaving the hard basalt plug as a towering crag—the perfect natural defensive position for a fortress. Human habitation on the rock dates back to at least the Iron Age.
2. It is the most besieged place in Britain
Edinburgh Castle has endured at least 26 major sieges in its 1,100-year history, making it the most besieged place in Great Britain and one of the most attacked fortresses in the world. Its strategic importance meant that whoever held the castle often held Scotland. Key sieges include the Lang Siege of 1573, which destroyed much of the medieval structure, and a clever 1341 recapture by Scots who disguised themselves as merchants.
3. It is home to the oldest building in Edinburgh
St Margaret's Chapel, a small, simple stone building, is the oldest surviving structure in Edinburgh, dating back to around 1130. Built by King David I in memory of his mother, Queen Margaret, it survived Robert the Bruce's order to destroy the castle's defences in 1314. For a time it was used as a gunpowder store before being restored in the 19th century.
4. The Crown Jewels were lost for over 100 years
The 'Honours of Scotland'—the Crown, Sceptre, and Sword of State—are the oldest crown jewels in the British Isles. After the 1707 Act of Union between England and Scotland, they were locked away in a chest within the castle and forgotten. They were rediscovered in 1818 by Sir Walter Scott and have been on display ever since.
5. It was once a major prison
The castle's vaults and cellars served as a prison for centuries. Prisoners held here included pirates, prisoners of war from conflicts like the American War of Independence, and even a five-year-old French drummer boy captured during the Napoleonic Wars. You can still see carvings made by prisoners on the ancient wooden doors.
Traditions and Curiosities
Beyond its military history, the castle is known for its unique daily traditions and legendary artefacts.
- The One o'Clock Gun: Since 1861, a gun has been fired from the castle's battlements almost every day at 1 p.m. (except Sundays, Good Friday, and Christmas Day). This tradition began as a time signal for ships in the Firth of Forth.
- Mons Meg: This enormous medieval siege cannon, built in 1449, was a gift to King James II in 1457. It could fire a 150kg gunstone over a distance of nearly two miles. It sits today outside St Margaret's Chapel.
- The Stone of Destiny: Housed alongside the Crown Jewels, this ancient sandstone block is the coronation stone for Scottish monarchs. It was taken by England in 1296 and finally returned to Scotland in 1996, 700 years later.
- A Dog Cemetery: The castle is home to a small, private dog cemetery, established in the 1840s by soldiers of the garrison as a final resting place for their regimental mascots and beloved pets.
- The Castle is Haunted: Legends tell of several ghosts, including a headless drummer boy whose appearance in 1960 supposedly foretold a major event, and a phantom piper who vanished while exploring the tunnels beneath the castle.
From its volcanic foundation to its enduring military and royal traditions, Edinburgh Castle is a living monument to Scottish history. To experience these stories for yourself, you can book tickets to explore its ancient halls and ramparts.
Frequently asked questions
Why is Edinburgh Castle so famous?
Edinburgh Castle is famous for its dramatic setting atop an extinct volcano, its role as a key royal fortress in Scottish history, and for being the most besieged place in Great Britain. It is also home to the Crown Jewels of Scotland and the Stone of Destiny.
Who owns Edinburgh Castle today?
Edinburgh Castle is owned by the Scottish Ministers and managed by Historic Environment Scotland. It remains an active military base and serves as the headquarters for several Scottish regiments of the British Army.
What is the oldest part of Edinburgh Castle?
The oldest surviving building within the castle complex, and in all of Edinburgh, is St Margaret's Chapel. It was constructed around 1130 by King David I.
Ready to uncover centuries of history? Secure your spot by booking your Edinburgh Castle tickets in advance and witness these incredible facts come to life.