Seriously though? It's a good question. Anyway, London has some of the best collections of art in the world and someone who appreciates art could definitely spends DAYS exploring (or doing one of my favorite museum activities: statue impressions) the different museums, parks, palaces, buildings & churches- Tate Modern, Madame Tussaud's, the National Gallery, the British Museum, Victoria & Albert Museum and the list continues...How Does One Measure the Success of A Museum? - Paul Getty
We were able to spend a good chunk of time at the British Museum (above - Ryan) & National Gallery during our days in London. The British Museum (which is giant) is the home of the Rosetta stone, the controversial pieces of the Parthenon and historical art & artifacts from ancient Greeks, Egyptians, Romans up to modern times.
The National Gallery was also a very impressive collection of paintings from the 1200's to present. My favorite paintings were big, epic scenes and I enjoyed the works of Canaletto, Guardi & painting from the 16th & 17th centuries.
One piece of art I wish I could've enjoyed was attending a football match. Unfortunately, tickets to the matches in London that weekend, Chelsea FC (my favorite club) vs Burnley & Tottenham vs Birmingham, were sold out...