The last place of our guide is the Zappeion Gardens. They are surrounded by the streets Irodou Attikou, Vasileos Konstantinou, Vasilissis Olgas, Vasilissis Amalias and the National Gardens. The Zappeion Gardens comprise 83.000 square meters of planted area (soft surfaces), 41.000 square meters of paved surfaces, and 2400 square meters of atriums and patios. The hills of Ardittos and Agras, which surround the Panathenaic Stadium, are also controlled and maintained by the Olympia and Bequests Committee. The hills are woodlands of approximately 70.000 square meters. In 1907, the Panathenaic Stadium, the property of the Olympia and Bequests Committee, was rendered to the Olympic Games Committee (today's Greek Olympic Committee) for its use. The first trees in the Zappeion Gardens were planted in 1857. The planting was supervised by the Athenian agriculturist Antionios Schmitt, son of the Bavarian chief-gardener of the Kings Garden Frederik Schmitt. While revising the drawings for the Zappeion Exhibition Hall, the architect Theodore Hansen also designed the layout of the gardens. According to architectural historian Constantine E. Biris, the French Architect Desire Matton executed the design incorporating some changes. The Zappeion Gardens, initially in French geometrical style, were later redesigned in the free curved lines of the English garden. The wish of Evangelis Zappas was to bring out the beauty of the idyllic and historical landscape of the Ilissos riverside area. The Olympia and Bequests Committee, in its effort to restore and refurbish the gardens, proceeded with, and for the first time, made an account of the existing flora of both the Zappeion Gardens and the Ardittos and Agras hills. Based on the 1956 plans, 14.000 square meters of turf were reintroduced together with complementary vegetation along the fences and the edges. Furthermore, additional complementary planting was carried out on existing rows of trees and the necessary enrichment utilizing new species of trees and bushes.