First September Satruday on the 7^th September 2019 National Technical Museum is joining to celebrations of European Heritage Days. The main building on Letná in Prague is open for reduced addmission fee 50 CZK. Centre for Building Heritage of NTM in Plasy and Railway depositary in Chomutov are avaibale to be visited for free on that day. We have also prepared an interesting prgramme. (available only in the Czech language)