01 Feb 2006, Colonia, Federated States of Micronesia --- The name Mortlock Islands has been used to refer to more than one group of islands in the Pacific Ocean. --- Image by © Bob Krist/Corbis
22 Apr 2004, Cove, Benin --- This mask is for the Guedelé dance, a traditional mask dance from Benin. --- Image by © Atlantide Phototravel/Corbis
12 Oct 1968 --- Masked Be-In participant with a "Eugene McCarthy for President" button makes a peace sign. --- Image by © Harvey L. Silver/Corbis
Man in a jump suit and gas mask standing in front of a cement wall with a map --- Image by © Alejandro Almaraz/Corbis
1928, Tibet, China --- This Choni skeleton performer will dance in the "Old Dance" --- Image by © Dr. Joseph F. Rock/National Geographic Creative/Corbis
1928, Tibet, China --- Dancers, known as Bowa, pose as Gombo, Masur Lhamo, and their wives --- Image by © Dr. Joseph F. Rock/National Geographic Creative/Corbis
1934, China --- Two Chinese actors wear conventionalized ancient court dress --- Image by © W. Robert Moore/National Geographic Creative/Corbis
1928, Bali, Indonesia --- Balinese dancers pose for a picture before their performance --- Image by © Franklin Price Knott/National Geographic Creative/Corbis
1947, Guatemala --- Bull dancers sport masks at the Quetzaltenango fair --- Image by © Luis Marden/National Geographic Creative/Corbis
1926, Guatemala --- Guatemalan Indians reenact the Quiche struggle under Alvarado --- Image by © Jacob J. Gayer/National Geographic Creative/Corbis
22 Apr 2004, Cove, Benin --- This mask is for the Guedelé dance, a traditional mask dance from Benin. --- Image by © Atlantide Phototravel/Corbis
Cape Town, South Africa --- African Tribal Mask --- Image by © Hoberman Collection/Corbis
23 Sep 1964 --- 1960s Standing Full Length Portrait Of Astronaut In Space Suit And Helmet --- Image by © H. Armstrong Roberts/ClassicStock/Corbis
1928, Tibet, China --- The chief dancer impersonates King Yama, the god of the dead --- Image by © Dr. Joseph F. Rock/National Geographic Creative/Corbis
1931, Tibet, China --- An impersonator of the Yak demon poses in costume --- Image by © Dr. Joseph F. Rock/National Geographic Creative/Corbis
1951, India --- Novice red lamas dressed as demons strike threatening poses on steps --- Image by © Volkmar K. Wentzel/National Geographic Creative/Corbis
1931 --- A Tibetan creature fabled to be a demon --- Image by © Dr. Joseph F. Rock/National Geographic Creative/Corbis
1952, Phnom Penh, Cambodia --- On steps to a throne room, dancers duel in a scene from the Ramayana --- Image by © George W. Long and J. Baylor Roberts/National Geographic Creative/Corbis
03 Mar 2004, Stockholm, Sweden --- Scary Face, Stockholm, Sweden --- Image by © Bruno Ehrs/Corbis
Melbourne, Victoria, Australia --- Mr Moon, the famous facade at the entrance to Luna Park, a St Kilda symbol since 1912. --- Image by © Jon Hicks/Corbis