2016 marks the centenary of Ernst Mach’s death. Some five years ago, in anticipation of this anniversary, the Czech physical society proposed to designate the building in Prague where Ernst Mach worked as an EPS historic site. Once accepted, the administrative and design planning for the plaque could begin. Indeed, the historical building, the former Institute of Physics, is located in the UNESCO protected Old Town of Prague, recognised by UNESCO’s cultural heritage programme, where patience and attention to details is required. Fortunately enough, the building is still part of Charles University, which – after initial detailed scrutiny of the project – considerably helped obtain the necessary authorisations.