The 14th does the English thing better than anywhere else in Paris: a park that pretends it's a stretch of the home counties, and a student campus where thirty nations each built a house. This is a morning's walk through both, with an artists' mews as the payoff.
Start on the Cité internationale universitaire — the RER drops you at its gate. Walk the lawn in front of the Maison internationale, then west to the two Le Corbusier pavilions standing together: the Swiss on its concrete legs, the Brazilian in primary colour. You don't have to go in, but the Swiss lobby and its curved mural reward the minute it takes.
Cross into Parc Montsouris proper. Haussmann's men laid it out in the 1860s as deliberate countryside — lawns that roll, paths that wander, a lake with ducks. Find the slim meteorological tower and the old meridian marker hidden in the grass.
Leave by the north and climb to Villa Seurat, the studio lane where Henry Miller wrote, then up the stepped rue des Artistes. Glacière on the M6 takes you home.