What can be found in London?
Gee lets see; history dating back centuries, royalty, incredible architecture old and new, great public transport, excellent theatre, some of the most iconic buildings on the planet, WW2 war rooms as they were left and from where Sir Winston Churchill directed England's war efforts ( you've heard of Churchill haven't you), Westminster Abbey ( where such famous people as Chaucer, Dickens, Charles Darwin and countless Kings and Queens like Mary Queen of Scots are buried).
Then there are Van Goughs, Turners, Cezannes in the free museums, a good music scene, wonderful parks, the river Thames, fabulous markets.
If all u what want is nightlife and club hopping you'll find it there as well.