London is an amazing city with ALOT to do in and around London itself. If you have time to see more than just the main sites and want to get out of the city, I recommend a trip to Ouse Valley Viaduct in Hayward’s Heath. The rail bridge is really beautiful and architecturally interesting - both an Architecht’s and a photographer’s dream! On a sunny day it’s also really nice to walk around the surrounding countryside and enjoy a picnic. It’s half way between London and Brighton and easily reachable either by train from London Victoria or by car if the M25 is within easy reach. Visiting the viaduct can be combined with a trip to Brighton or the south coast.