The White Tower is a central tower, the old keep, at the Tower of London. It was built by William the Conqueror during the early 1080s, and subsequently extended. The White Tower was the castle's strongest point militarily, provided accommodation for the king and his representatives, and housed a chapel. Henry III ordered the tower whitewashed in 1240. Today the Tower of London is a museum and visitor attraction. The White Tower now houses the Royal Armouries collections.