The National Gallery
Not a great composition, but I like the shadow contrast on the building and the texture of the water on the flagstones. The water from the fountain turned out ok too.
Wasn't too happy with this one at the time, so changed position to take Busy Night at Trafalgar Square. That one turned out much better.
Canon EOS 500D / ISO 100 / f/10 / 18-55mm @ 18mm / 10 seconds 0EV, 2.5 seconds -2EV, 30 seconds +2EV