and front of the cathedral were also improved and heightened. At this time, a tall lead-encased wooden spire topped the central tower but was blown down in a storm in 1548. With its spire, the tower reputedly reached a height of 525 feet (160 m) (which would have made it the world's tallest structure, surpassing the Great Pyramid of Giza, which held the record for almost 4,000 years). Although still doubted, this is the height agreed upon by the majority of historians. Other additions to the cathedral at this time included its elaborate carved screen and the 14th-century misericords, as was the Angel Choir. For a large part of the length of the cathedral, the walls have arches in relief with a second layer in front to give the illusion of a passageway along the wall. However the illusion does not work, as the stonemason, copying techniques from France, did not make the arches the correct length needed for the illusion to be effective. In 1398 John of Gaunt and Katherine Swynford founded a chantry in the cathedral to pray for the welfare of their souls. In the 15th century the building of the cathedral turned to chantry or memorial chapels. The chapels next to the Angel Choir were built in the Perpendicular style, with an emphasis on strong vertical lines, which survive today in the window tracery and wall panelling. Magna Carta Hugh of Wells, Bishop of Lincoln, was one of the signatories to Magna Carta and for hundreds of years the cathedral held one of the four remaining copies of the original, now securely displayed in Lincoln Castle. The Lincoln Magna Carta was on display at the British Pavilion during the 1939 New York World's Fair. In March 1941, the Foreign Office proposed that the Lincoln Magna Carta be gifted to the United States, citing the "many thousands of Americans who waited in long queues to view it" and the US passage of the Lend-Lease Act, among other reasons. In 2009 the Lincoln Magna Carta was lent to the Ronald Reagan Presidential Library in Simi Valley, California. There are three other surviving copies: two at the British Library and one at Salisbury Cathedral. Little Saint Hugh In August 1255 the body of an eight-year-old boy was found in a well in Lincoln. He had been missing for nearly a month. This incident became the source of a blood