1. Tower of London: Best time to visit is during the summer, when the days are longer and the attractions are open longer.
2. Westminster Abbey: Best time to visit is during the weekday mornings, when the crowds are smaller.
3. Buckingham Palace: Best time to visit is during the summer months, when the Changing of the Guard ceremony is taking place.
4. St. Paul's Cathedral: Best time to visit is during the weekday mornings, when the crowds are smaller.
5. The British Museum: Best time to visit is during the weekdays, when the crowds are smaller.