The Wellington Arch stands at Hyde Park Corner, close to Wellington’s Apsley House. On top of it is a great bronze statue, the largest in Britain, depicting the angel of peace descending on the chariot of war. Visitors can go inside the Arch, to view three floors of exhibitions and enjoy views from the balconies near the top.
A visit inside is interesting, and the exhibition explains that the Arch originally was elsewhere and also had a different statue on top.
One can buy a joint ticket for the Wellington Arch and Apsley House. To make a day of it, one can also view the various monumental sculptures nearby, and then walk through the park to the Marble Arch, checking some more old and modern sculpture installations on the way.
You can travel here by tube or bus.