People visit European institutions' buildings in Brussels during Open Day

A man with a virtual reality headset tries safe riding in the Berlaymont building, the European Commission headquarters, during the Open Day of the European institutions in Brussels, Belgium, May 4, 2019. The Open Day is a unique opportunity for the public to discover how the European institutions operate. Visitors have free access to the institutions' buildings and some special introductory activities. (Xinhua/Zheng Huansong)