In 1675, Wren was commissioned to design the Royal Observatory at Greenwich. In 1682, he designed a hospital in Chelsea, London for retired soldiers, and in 1696 a hospital for sailors in Greenwich. Other buildings include Trinity College Library in Cambridge (1677 - 1692), and the facade of Hampton Court Palace (1689 - 1694). Wren often worked with the same team of craftsmen, including master plasterer John Groves and wood carver Grinling Gibbons.