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On the grounds of Howth Castle lies a collapsed Dolmen known locally as Aideen's Grave. This huge megalithic monument consists of portal stones and a capstone. The capstone, which has slipped away from the portal stones weights around 75 tonnes.
And so the story goes that this tomb is the burial place of Aideen, wife of Oscar (the son of Oisin). In his first battle, Oscar killed 3 kings. He was said to be the bravest of all the Fianna. He died at the battle of Gabhra and it is said that Aideen died in grief from her loss, so Oisin buried her at Howth and set a cairn over her, a burial usually reserved for great warriors or kings.
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The Cache
There is a car park on site at Deer Park Hotel and Golf Club. Follow the path along the right of the hotel. You will see a sign pointing the way to the Dolmen along this path on the right hand side.
The cache is a small container with room for logbook and a few items.