John Carr of York (1723 âEUR" 1807) was one of the most prolific and significant architects of the eighteenth century, with an output of over 400 designs, most of which were executed. His designs vary from simple gateways through to the grandest schemes, such as that for the palatial hospital at Oporto in Portugal, Harewood House and village in Yorkshire, and Basildon Park in Berkshire.