the original quarry in Croatia, and correct all minor displacement of stones caused by the freeze-thaw activity. Underlying structural flaws were also corrected. Queen Elizabeth II, escorted by Prince Philip, Duke of Edinburgh, rededicated the restored memorial on 9 April 2007 in a ceremony commemorating the 90th anniversary of the battle. Other senior Canadian officials, including Prime Minister Stephen Harper, and senior French representatives, Prime Minister Dominique de Villepin among them, attended the event, along with thousands of Canadian students, veterans of the Second World War and of more recent conflicts, and descendants of those who fought at Vimy. The crowd attending the rededication ceremony was the largest crowd on the site since the 1936 dedication. Centennial commemoration The centennial commemoration of the Battle of Vimy Ridge took place at the memorial on 9 April 2017, coincidentally during the Canadian sesquicentennial celebrations. Estimates before the event indicated that an audience of up to 30,000 would be present. The Mayor of Arras, Frédéric Leturque, thanked Canadians, along with Australians, Britons, New Zealanders and South Africans, for their role in the First World War battles in the area. Attending dignitaries for Canada included Governor General David Johnston; Prince Charles; Prince William, Duke of Cambridge; Prince Harry; and Prime Minister Justin Trudeau. President François Hollande and Prime Minister Bernard Cazeneuve represented France. Elizabeth II issued a statement via the Governor General, remarking "[Canadians] fought courageously and with great ingenuity in winning the strategic high point of Vimy Ridge, though victory came at a heavy cost". Two postage stamps were released jointly by Canada Post and France's La Poste featuring the memorial, one designed by each country, to commemorate the centennial of the Battle of Vimy Ridge. Site The Canadian National Vimy Memorial site is located approximately north of Arras, France, circled by the small towns and communes of Vimy to the east, Givenchy-en-Gohelle to the north, Souchez to the northwest, Neuville-Saint-Vaast to the south and Thélus to the southeast. The site is one of the few places on the former Western Front where a visitor can see the trench lines of a First World War battlefield and the related terrain in a preserved natural state. The total area of the site is , much of which is forested and off limits to visitors to ensure public safety. The site's rough terrain and buried unexploded munitions make the task of grass cutting too dangerous