A visitor takes photos at an apartment in a building transformed from an office building during the Open House Athens event in central Athens, Greece, on April 7, 2019. The Greek capital hosted for the sixth consecutive year this weekend a two-day event of Open House Athens, which invites the public to explore the value of architecture through various landmarks. Historical monuments of the 19th century, ultramodern cultural centers, luxurious lofts and religious sites turned from former industrial spaces, all opened their gates to visitors. (Xinhua/Lefteris Partsalis)