THE ASCENSION OF AVALON. Sacred England & Mysteries of the Tudor Rose. September 4-13, 2016. GREAT BRITAIN. “Ascension of Avalon” is a 10 day adventure to the sacred places and spiritual roots of the holy island, Great Britain, and her greatest mystery, Avalon - the place where this world and the otherworld meet. Winchester. Salisbury. Glastonbury. Avebury. Stonehenge. Windsor Castle. Hampton Court Palace. Hever Castle and more.