St Peter's Roman Catholic Church

Displayed in a glittering brass-and-glass case in the north transept, the shrivelled head of St Oliver Plunkett (1629–81) is this church's main draw (the rest of the martyr was separated at his hanging in 1681). It's actually two churches in one: the first was designed by Francis Johnston in a classical style in 1791; the neo-Gothic addition was built in the late 19th century.