Watch the Vernal Equinox Sunrise roll up the slopes of Silbury Hill, in Wiltshire UK near Avebury. As the sun rises, it appears to increase in size — perhaps symbolizing the waxing fertility of the land as it illuminates this fantastic human-made chalk hill (the tallest such construction in Europe) which some believe represents the womb of the Great Mother.
http://www.youtube.com/watch?v=mw4GAxe-ZwQ
Spring Equinox Sunrise at Silbury Hill