A long-time favourite of royals, Kensington Palace was the palace in London in the 17th and 18th centuries. This marvellous mansion was chosen by William and Mary of Orange in order to improve the health of the former, and its many magnificent rooms are now open for the public to explore. There is a special section set aside for the early years of Queen Victoria, well worth the admission alone. That admission is considerably cheaper when booked online.