Trafalgar Square is the largest square in London. It has important historical value and monuments and statues with personal heritage. Initially, most of the area of this square was the courtyard of the Great Temple stables serving the Whitehall Palace. The former site was called Charing Cross, now known as Charing Cross after forming a memorial cross. The subway station "Metro" today is still famous for this name. In 1812, architect John Nash wanted to open a new street between Charing Cross Street and Portland Square. An open square - formed by this development, wisely used as a public cultural open space. Trafalgar Square experienced many changes in the 19th century, officially named Trafalgar Square in 1830. The actual work of the National Gallery began in 1832. In 1838, architect Sir Charles Barry proposed some new concepts, and he wanted to build an upper platform and a lower-level square next to the National Gallery, connected by stairs, which also included a statue of Nelson and two fountains. Following these changes, the design of Trafalgar Square was finally implemented between 1840 and 1845, when the fountain was built in a short period of time, and in 1867 the bronze lion was placed at the bottom of Nelson's column. 1876, British units inches, feet, yards, chains, chains, perch and wooden poles were set up on the walls of the North Terrace. These measures are relocated when the central staircase is added. The cafe in the square tells you details of all these measures. This place is seen as a center of national democracy and protest, and even today, rallies and demonstrations on political, religious and general issues are often held on weekends.