Possible Clues:

• In awe of an open, old prison for five hundred
• Wowed
• Surprised to see Mother in an A-Z
• Stunned in the morning by Observer crossword
• Surprised remarkable dame holding all the letters
• 'The ___ of the moral universe is long, but it bends toward justice': M.L.K
• Left speechless
• More than startled
• Taken aback by Bill locking up old prison
• Astonished -- a day to go round part of Hampton Court