Edinburgh Castle is a historic castle in Edinburgh, Scotland that stands on Castle Rock.  There is evidence that at least 26 sieges took place which makes it one of the most besieged landmarks in the world.  Reports of ghost sightings and paranormal activity dates back hundreds of years.
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RESOURCES:

• Iron Age Scotland History (britainexpress.com)
• History of Edinburgh Castle
• Edinburgh Castle: Scotland's Haunted Castle - Amy's Crypt (amyscrypt.com)
• Edinburgh Castle is allegedly haunted by a child bagpiper who was buried alive in tunnels beneath it - Edinburgh Live
• The Legends and Mysteries Surrounding Edinburgh Castle (thevintagenews.com)
• Is Edinburgh Castle Haunted? |7 Ghosts & Spooky Tales  | (mymacabreroadtrip.com)
• Hauntings and Ghosts of Edinburgh Castle - Spooky Traveler
• The Ghosts of Edinburgh Castle | Haunted Rooms®
• Edinburgh Castle - The Little House of Horrors
• Edinburgh Castle: Timeline of Hauntings and Dark History (spookyscotland.net)