A stroll around Geneva's beautiful Old Town is a must. Its main street, the Grand-Rue, shelters the Maison de Rousseau et de la Literature at No 40, where the 18th-century philosopher Jean-Jacques Rousseau was born. Nearby, the part-Romanesque, part-Gothic Cathédrale St-Pierre is where Protestant John Calvin preached from 1536 to 1564. Beneath the cathedral is the Site Archéologique, an interactive space safeguarding fine 4th-century mosaics and a 5th-century baptismal font. You can trace Calvin’s life in the neighbouring Musée International de la Réforme.