a jazz museum in public toilets, a public dump that can be visited like a museum, the oldest organ in Vienna hidden behind a painting, an empress dressed as a nun, the mystery of the symbol 05, a masculine sex discreetly sculpted on the cathedral of Vienna, a surprising private museum of billiards, an incredible bouquet where each flower actually consists of several butterfly wings, a source of water that allows to see the lotto figures for a minute, an extraordinary underground annex of the Mauthausen camp where the world's first jet was built, a charming historic «love hôtel»