Park Square and Park Crescent Gardens are two of Regent's Park's grandest gardens and two of London's larger communal garden squares. Designed by John Nash and managed since 1824 by the Crown Estate Paving Commission, they retain most of their original layout. The Grade II listed Nursemaids’ Tunnel, built in 1821, is an early example of a pedestrian subway and among the earliest surviving in London connecting Park Square to Park Crescent. Two splendid plane trees, planted in 1817 to mark the 1815 Allied victory at Waterloo, dominate Park Crescent. Other distinctive trees include a tulip (Liriodendron tulipifera) and weeping silver lime (Tilia tomentosa ‘Petiolaris’).