In order to commemorate the 100th anniversary from the declaration of Czechoslovakia, the National Museum and the Slovak National Museum have prepared a project called Czech-Slovak Exhibition and Slovak-Czech Exhibition. Visitors of the Bratislava Castle and later on of the Historical Building of the National Museum in Prague will be guided through the history of Czechoslovakia. It will remind them how unreal seemed the project of this country at its very beginning, it will point at what connected and divided these two nations. This would be demonstrated on the destinies of some concrete people. A rich accompanying programme is prepared too.