Important buildings of that era include ; the building of the Athens Conservatoire on Rigillis Street . It was originally conceived by Ioannis Despotopoulos as part of a large cultural centre in 1959 which went through many alterations and finally stalled . Finally , only the Athens Conservatoire was built between 1969 – 1976 . The building is praised for its clean lines , the feeling of transition when one moves from the street into the building , and Despotopoulos 's handling of both tradition and monumentality ; the building of the National Hellenic Research Foundation , which was designed by Constantinos Doxiadis and built between 1965 – 1968 . Similar to Oscar Niemeyer 's buildings , its front and rear façades have strict grids while its lateral ones are covered by smooth marble . Moreover , the library wing with its low height makes a contrast with the taller office wing in the background ; the Hilton Athens which was designed by Emmanouil Vourekas , Prokopis Vasileiadis , and Spyros Staikos and completed in 1963 . It is a modern building ; however , the extensive use of white marble and thin columns made it an example of the " classicizing modernism " of that period , similar in fashion to the United States embassy building in Athens designed by Walter Gropius and completed in 1961
United States embassy building in Athens
Embassy of the United States, Athens
Modern architecture in Athens