of the construction was the building of the roads leading to the mausoleum, The Lions Road, and the ceremonial ground; the mausoleum's upper-level stone pavement, the grand stairs, placement of the grand tombstone, and the installation of electricity, plumbing and heating systems. The fourth and last stage of construction was the laying of the Hall of Honour pavement, vaults under the side linings, and Hall of Honour perimeter stone profiles and fringe decorations, which was completed on 1 September 1953. Revision of original plans The Anıtkabir project originally had a vaulted ceiling above the mausoleum carried by the perimeter columns. On 4 December 1951, the Government asked the architects about the possibility of shortening construction time by lowering the high ceiling of the Hall of Honour. After studying the subject, the architects concluded that it was possible to cover the ceiling with a reinforced concrete slab instead of a stone vault. This change reduced the weight of the ceiling and also eliminated certain constructional risks. Surface reliefs and stones All stones and marbles were brought in from various parts of Turkey. Easily processed porous travertine is used on external cladding of the concrete surfaces and marble is used for the inside surfaces of the Hall of Honour. White travertine used for the sculpture groups, lions figures and the mausoleum columns was brought from Kayseri and the travertine used inside the towers was brought from Polatlı and Malıköy. The red and black travertine used for paving the ceremonial ground and floors of the towers came from Kayseri. Yellow travertine brought from Çankırı was used for building the Victory Reliefs, the Hall of Honour's external walls, and perimeter columns of the ceremonial ground. The red, black and cream colour marble that was used on the floor of the Hall of Honour were brought from Hatay, Adana and Çanakkale, and for the internal walls, tiger-patterned marble from Afyon and green marble from Bilecik was used. The sarcophagus, a monolithic tomb stone weighing 40 tons, was brought from Adana and the white marble covering the sides of the sarcophagus were also from Afyon. Layout There are four main parts to Anıtkabir: the Road of Lions, the Ceremonial Plaza, the Hall of Honor (location of Atatürk's tomb) and the Peace Park that surrounds the monument. Road of Lions The approach to the monument is a -long pedestrian walkway that is lined on both sides by