Created in 1868 at the foot of the former École Polytechnique’s listed buildings, Paul Langevin Square (originally “Monge Square”) spreads across 4,328 m² of exotic trees – magnolias, sophoras, sycamores, ashes, American walnut and honey locust – nestled in Paris’s lively 5th arrondissement.

At its heart stands a monumental staircase, lushly covered in ivy and Turkestan knotweed, once leading to classrooms. At its base, the Childebert Fountain (1715–1717) adds a historical, cooling touch. The site also houses remnants of the former City Hall (Renaissance niches and ceramics from the 1889 Universal Exposition), as well as a stone statue of François Villon from 1947, by René Collamarini.

Visitors flock here to stroll, read, or relax on the many benches – students, Parisians, and tourists mingle naturally. The children’s playground is a hit with families. Free entry, plus practical amenities (accessible toilets, drinking water, wifi, sunny and shaded seats) make it an ideal urban retreat.

Perfect for a scholarly break or casual gathering, the square attracts a diverse crowd: Latin Quarter students, families, history buffs, and curious walkers. Some statues were beheaded during May 1968 and never restored, while the fountain recalls its origins with the nuns from Saint‑Germain‑des‑Prés.

Practical info: Open daily from May to August, 8 am–8:30 pm (9 am on weekends), including public holidays. Public transport (metro Maubert‑Mutualité/Place Monge, nearby buses) ensures easy access.