Principal exteriors were shot on location in the United Kingdom. A second unit filmed the medieval walls and towers of the Cité de Carcassonne in the town of Carcassonne in Aude, France, for the portrayal of Nottingham and its castle. Locksley Castle was Wardour Castle in Wiltshire -- restored in an early shot using a matte painting. Marian's manor was filmed at Hulne Priory in Northumberland. Scenes set in Sherwood Forest were filmed throughout England: Burnham Beeches in Buckinghamshire was used for the outlaws' encampment, Aysgarth Falls in Yorkshire for the fight scene between Robin and Little John, and Hardraw Force in North Yorkshire was the location where Marian sees Robin bathing. Sycamore Gap on Hadrian's Wall was used for the scene when Robin first confronts the sheriff's men. Chalk cliffs at Seven Sisters, Sussex were used as the locale for Robin's return to England from the Crusades.
There are 32 UNESCO World Heritage Sites in the United Kingdom and the British Overseas Territories. The UNESCO list contains one designated site in both England and Scotland (the Frontiers of the Roman Empire) plus eighteen exclusively in England, five in Scotland, three in Wales, one in Northern Ireland, and one in each of the overseas territories of Bermuda, Gibraltar, the Pitcairn Islands, and Saint Helena. The first sites in the UK to be inscribed on the World Heritage List were Giant's Causeway and Causeway Coast; Durham Castle and Cathedral; Ironbridge Gorge; Studley Royal Park including the Ruins of Fountains Abbey; Stonehenge, Avebury and Associated Sites; and the Castles and Town Walls of King Edward in Gwynedd in 1986. The latest site to be inscribed was the Jodrell Bank Observatory in England in July 2019.
Nineteenth-century fictional depictions of John were heavily influenced by Sir Walter Scott's historical romance, Ivanhoe, which presented "an almost totally unfavourable picture" of the king; the work drew on Victorian histories of the period and on Shakespeare's play. Scott's work influenced the late 19th-century children's writer Howard Pyle's book The Merry Adventures of Robin Hood, which in turn established John as the principal villain within the traditional Robin Hood narrative. During the 20th century, John was normally depicted in fictional books and films alongside Robin Hood. Sam De Grasse's role as John in the black-and-white 1922 film version shows John committing numerous atrocities and acts of torture. Claude Rains played John in the 1938 colour version alongside Errol Flynn, starting a trend for films to depict John as an "effeminate ... arrogant and cowardly stay-at-home". The character of John acts either to highlight the virtues of King Richard, or contrasts with the Sheriff of Nottingham, who is usually the "swashbuckling villain" opposing Robin. An extreme version of this trend can be seen in the Disney cartoon version, for example, which depicts John, voiced by Peter Ustinov, as a "cowardly, thumbsucking lion". Popular works that depict John beyond the Robin Hood legends, such as James Goldman's play and later film, The Lion in Winter, set in 1183, commonly present him as an "effete weakling", in this instance contrasted with the more masculine Henry II, or as a tyrant, as in A. A. Milne's poem for children, "King John's Christmas".

Question: What is the list of World Heritage Sites, in the nation where the Prince of Thieves film, featuring the title character depicted alongside John, was made?
Answer: UNESCO World Heritage Site