Somerset House - Hermitage Gallery; Fountains
The courtyard of Somerset House has the "coolest" fountain in Central London. Somerset House is a majestic mansion on the Thames, just upriver from Charing Cross. It's been recently reconverted from governmental offices to a new incarnation as the home of the excellent Courtauld Collection of Paintings, as well as the London outpost for St. Petersburg's Hermitage Collection. The main entrance is just off the Strand.