Face mask worn by a man (centre) as he walks around Tokyo's oldest and biggest park, Ueno. Face masks are most often used in Japan by people who have colds, so as not to infect others, or to avoid catching infections themselves. Ueno park was opened to the public in 1873 in Tokyo, Japan, and has numerous temples, shrines, art museums and a zoo. Photographed in the spring, when the cherry blossoms (Prunus sp.) are in bloom.