What's the name of the most famous square in London?

Pigeon Square is located in old London. There is a square called Pigeon Square. It is next to St Martin's Church, the oldest church in London, with the National Gallery in front and the National Portrait Gallery on the side. There is a wide road between Pigeon Square and the National Gallery and the National Portrait Gallery. A few years ago, this road was so crowded with cars that it was difficult for people to get in. Now the government has changed this wide road into a sidewalk, and cars are not allowed in. Pigeon Square has become a very lively place, where many people gather and have various performances every night, becoming a veritable tourist and cultural square. In the British National Portrait Gallery, portraits of many famous British people since the Middle Ages are displayed all the year round, and the number of these oil paintings is second to none in the world. The British have a tradition of painting and appreciating oil paintings, but this custom has not changed today with the popularization of photography technology. Our English friends often ask us, have you ever painted oil paintings for yourself and your children? They were surprised when they knew that I had never painted an oil painting, and advised us to do it quickly, but China people didn't have this custom. Today, I feel very strange to draw an oil painting for myself. In this gallery, the history of Britain since the Middle Ages is basically displayed. These paintings include almost all British celebrities since15th century, such as Elizabeth I, Shakespeare, Charles I, Newton, Watt, Churchill, etc. I have only seen it in books before. Today, standing in front of the huge oil paintings painted by artists in those years, I feel very realistic. In modern times, there are not only oil paintings but also sculptures. Photos of Queen Victoria and her husband are also on display in this gallery. Victoria's husband is German Albert. He died more than 40 years before Queen Victoria. His greatest contribution was hosting the first World Expo. The next World Expo 20 10 will be held in Shanghai. In Hyde Park in London, there is a huge sculpture of Albert. He has a brochure in his hand, which is a list of exhibitors at the World Expo, surrounded by four groups of sculptures from Asia, Africa, Europe and America.