Sunsphere in World's Fair Park, Knoxville, Tennessee, United States of America, North America

Sunsphere in World's Fair Park, Knoxville, Tennessee, United States of America, North America

Plaza de Espana, built for the 1929 World Fair, Maria Luisa Park, Seville, Andalucia, Spain, Europe

Plaza de Espana, built for the 1929 World Fair, Maria Luisa Park, Seville, Andalucia, Spain, Europe

Sunsphere, World's Fair Park, Knoxville, Tennessee, United States of America, North America

Modern architecture, Pavilhao Atlantico, left, and skyscrapers Sao Gabriel and Sao Rafael, right, in the Parque das Nacıes park, site of the Expo 98, Lisbon, Portugal, Europe

Shopping Center Centro Comercial Vasco da Gama, Parque das Nacoes park, site of the Expo 98, Lisbon, Portugal, Europe

Gare do Oriente train station at night, architect Santiago Calatrava, on the grounds of the Parque das Nacoes park, site of the Expo 98, Lisbon, Portugal, Europe

Shopping Center Centro Comercial Vasco da Gama on the grounds of the Parque das Nacoes park, site of the Expo 98, Lisbon, Portugal, Europe

Eagle Ray (Myliobatidae) being fed, Discovery Cove, Orlando, Florida, USA, North America

Eagle Ray (Myliobatidae) being fed, Discovery Cove, Orlando, Florida, USA, North America

Vasco da Gama bridge over the Rio Tejo river in the Parque das Nacıes park, site of the Expo 98, Lisbon, Portugal, Europe

Platform at the Gare do Oriente train station, architect Santiago Calatrava, on the grounds of the Parque das Nacoes park, site of the Expo 98, Lisbon, Portugal, Europe