The Westminster Abbey Museum is located in the 11th century vaulted undercroft of St Peter. The exhibits include a unique collection of royal and other funeral effigies, together with other treasures, including the 13th century altarpiece known as the Westminster Retable.

Other items on display include the saddle, sword, helm and shield of Henry V, carried at his funeral in 1422; two panels of medieval glass; 12th century sculpture from the Norman abbey; Mary II's Coronation chair; replicas of the Coronation Regalia for coronation rehearsals; and the armour of General Monck carried at his funeral in 1670.