n a church, an inverted phallus at a well-known entrance, an atomic bomb shelter under Gare de l'Est, unsuspected traces of former brothels, a patron saint of motorists, royal monograms hidden in the Louvre courtyard, the presentation of Christ's crown of thorns, a prehistoric merry-go-round, a sundial designed by Dalí, war-wounded palm trees, bullet holes at the ministry, religious plants in a priest's garden, a mysterious monument to Freemasonry at the Champ-de-Mars, a solid gold sphere in parliament, a Chinese temple in a parking lot, the effect of the Bièvre river on Parisian geography, a blockhouse in the Bois de Boulogne ...

For those who thought they knew Paris well, the city is still teeming with unusual and secret places that are easily accessible.