lenofi:Entrance to Newgrange (Co. Meath, Ireland), a Neolithic passage tombThe window above the door
lenofi:Entrance to Newgrange (Co. Meath, Ireland), a Neolithic passage tombThe window above the door to the passage allows a shaft of light to illuminate a carving deep within the inner chamber on one day a year for approximately 17 minutes. This is possible due to the alignment of the entire structure and the gentle slope of the passage, ensuring the light enters above a visitor’s head and, upon reaching the inside of the corbelled chamber, is near the floor. -- source link
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