Carillons, like the famous medieval bells in Prague’s Loreta, are traditionally contained in a church belfry. Mobile ones are a bit more of a rarity, which makes the Travelling Carillon of Prague (Pražská mobilní zvonohra) , a 3.9-meter-high, 13-ton, 57-bell instrument that must be transported via Renault Magnum truck, one of the Czech Republic’s lesser-known holiday attractions.