These photo are taken during my 3 days of travel in several British cities, i.e., Nottingham, Oxford, Brighton, and London, after attending the conference QG-squared in Nottingham. Although this tour was constrained by time, and I had to walk for about 5 to 6 hours every day, it was very joyful. More importantly, I met an old friend of mine and his family; he is also my university classmate. We haven't seen each other for 11 years; however, this huge time gap didn't impact our friendship.