Stucco sculpture, Monster Mouth, The Tomb of Ukit Kan Lek Tok (Mayan Ruler), The Acropolis, Ek Balam, Mayan archaeological site, Yucatan, Mexico, North America

Monster Mouth Doorway, Structure II, Chicanna, Mayan archaeological site, Late Classic Period, Campeche, Mexico, North America

Monster Mouth Doorway, Structure II, Hochob, Mayan archaeological site, Chenes style, Campeche, Mexico, North America

Monster Mouth Doorway, Hormiguero, Mayan archaeological site, Rio Bec style, Campeche, Mexico, North America

Monster Mouth Doorway, Hormiguero, Mayan archaeological site, Rio Bec style, Campeche, Mexico, North America

Structure II, monster mouth temple, Central Plaza, Chicanna Archaeological Site, Campeche State, Mexico

Structure II, monster mouth temple at sunset, Central Plaza, Chicanna Archaeological Site, Campeche State, Mexico

Monster Mouth Door, Structure II, Mayan Ruins, Hormiguero Archaeological Zone, Rio Bec Style, Campeche State, Mexico, North America

Monster Mouth Door, Structure II, Mayan Ruins, Hormiguero Archaeological Zone, Rio Bec Style, Campeche State, Mexico, North America

Monster Mouth Door, Structure II, Mayan Ruins, Chicanna Archaeological Zone, Campeche State, Mexico, North America

Aerial of La Gueule du Monstre (the Monster's Mouth) cave, Rurutu, Austral islands, French Polynesia, South Pacific, Pacific

Aerial of La Gueule du Monstre (the Monster's Mouth) cave, Rurutu, Austral islands, French Polynesia, South Pacific, Pacific

Aerial of La Gueule du Monstre (the Monster's Mouth) cave, Rurutu, Austral islands, French Polynesia, South Pacific, Pacific

Wolf fish (Anarhichas lupus), head in profile with mouth open, St Abbs, Scotland, UK North Sea