Name one UNESCO World Heritage site in the UK, outside London.

Durham Castle and Cathedral is a notable UNESCO World Heritage site located outside of London and is recognized for its historical and architectural significance. The site reflects the outstanding architectural achievement of Norman military and ecclesiastical design, as seen in the impressive Durham Cathedral, which is considered one of the finest examples of Norman architecture in Europe. Both the castle and cathedral showcase exceptional medieval craftsmanship, with the cathedral also being one of the earliest buildings constructed in the Romanesque style in England.

In contrast, while Stonehenge and Bath are also UNESCO World Heritage sites, they may have been considered but are not the answer referenced here. Westminster Abbey, on the other hand, is a significant landmark in London recognized for its historical importance but does not meet the criteria of being outside the city. Thus, Durham Castle and Cathedral stands out as a prime example of the rich cultural heritage found in the UK beyond London.