Souvenirs including Chairman Mao Keyrings and unofficial 2008 Olympic mascots on sale at Mount Baoding, China

Souvenirs including Chairman Mao keyrings and Mickey Mouse toys on sale at Mount Baoding, China

Trader by the Damnern Saduak floating market in Bangkok, Thailand

Souvenirs on sale at Big Wild Goose Pagoda, Xian, China

Key rack with front door keys from elderly people who are registered with the home care service of the German Red Cross in Koblenz, Rhineland-Palatinate, Germany, Europe

Office towers, European Court of Justice, Kirchberg quarter, Europe District, Luxembourg, Europe

Keyrings with Spanish surnames, Madrid, Spain, Europe

Close-up of a key ring in a person's pocket, Las Vegas, Nevada, USA