Head off to discover hidden tunnels and a bomb shelter beneath the Old City, follow a secret passage open once a year, admire the cathedral's Orpheus capital, pray at Calvin's fake grave, look for the plaque that compares the pope with the Antichrist, visit the secret gardens of the Carouge district, discover why the national monument represents two Savoyard women, learn where Frankenstein was created, sleep in Professor Calculus' room, and more.