Eton was founded by King Henry VI in 1440 and lies just across the river Thames from the pretty Berkshire town of Windsor; most famous for its royal castle.

http://www.etoncollege.com/Default.aspx

The royal family may have left Hampton Court in 1737 but the palace and its apartments soon found another purpose. From the 1760s onwards, the palace was divided up for ‘grace-and-favour’ residents who were granted rent-free accommodation because they had given great service to the Crown or country. They lived, often with their own small households of servants above, underneath and around the state apartments.

The caves at Chislehurst (30 minutes from London Bridge Train Station) are a labyrinth of man made tunnels forming a maze covering over six hectares thirty metres below the woodlands above.