Byzantine architecture of Aya Sofya (Hagia Sophia), constructed as a church in the 6th century by Emperor Justinian, a mosque for years, now a museum, UNESCO World Heritage Site, Istanbul, Turkey, Europe

Byzantine architecture of Aya Sofya (Hagia Sophia), constructed as a church in the 6th century by Emperor Justinian, a mosque for years, now a museum, UNESCO World Heritage Site, Istanbul, Turkey, Europe

Tombs inside Panteon de los Heroes, Asuncion, Paraguay, South America

Ceiling and walls, Mezzanine of the Great Hall, Library of Congress, Washington D.C., United States of America, North America

Tourists walking around the Befreiungshalle (Hall of Liberation) upon Mount Michelsberg above the city of Kelheim, Bavaria, Germany, Europe

Ceiling and walls, Mezzanine of the Great Hall, Library of Congress, Washington D.C., United States of America, North America

Guangzhou Library, Zhujiang New Town area, Guangzhou, Guangdong, China, Asia

Confeiteria Colombo, historic and traditional Portuguese art nouveau cafe in the city centre, Rio de Janeiro, Brazil, South America

Tourists walking around the Befreiungshalle (Hall of Liberation) upon Mount Michelsberg above the city of Kelheim, Bavaria, Germany, Europe

Guangzhou Library, Zhujiang New Town area, Guangzhou, Guangdong, China, Asia

People inside Panteon de los Heroes, Asuncion, Paraguay, South America

Central Station interior, Norrmalm, Stockholm, Sweden, Scandinavia, Europe

Ceiling and walls, Mezzanine of the Great Hall, Library of Congress, Washington D.C., United States of America, North America

Interior of the Koryo Hotel, Pyongyang, Democratic People's Republic of Korea (DPRK), North Korea, Asia