So what is Britain most famous for? Big Ben? The Tower of London? The London Eye? London? There's a lot more to the country than just London, though many first time visitors might not go much further than the capital. https://en.wikipedia.org/wiki/London
Britain is full of history and has many areas of some of the most beautiful countryside, like the Derbyshire Peaks District, the Lakes District, Snowdonia, and everything in between really. There are many interesting towns and cities like York, Bath, Manchester - the list is endless.
Britain is not so famous for its fine dining, but this is changing and there are some good traditional dishes like fish and chips, roast Sunday lunch, a 'full English breakfast' that go down very well. https://en.wikipedia.org/wiki/Fish_and_chips
Have you ever been to visit Britain? Have you been anywhere other than London?