London is located on the River Thames and has an oceanic climate with cool, rainy winters and warm summers. Important landmarks include the Tower of London, Kew Gardens, Westminster, and Greenwich. Downtown areas include Piccadilly Circus, while notable buildings are Westminster Abbey, Buckingham Palace, and 30 St Mary Axe. The West End features Trafalgar Square, Oxford Street, and Soho, known for pubs, cinemas and nightlife. London has an extensive underground rail system and is home to several universities and sports stadiums.