Pancras Station St. Banqueting House , Whitehall SW1. Only remaining part of Palace of Whitehall built 1619-1622.
Admission includes audio tour.
Museum of London , London Wall, Barbican, EC2 . Old Royal Observatory , Greenwich Park, SE10. Daily 10 am - 5 pm. Special services or events may close some or all. Sat 0830-4 pm.