Parc André Citroën

Parc André Citroën isn't your typical Parisian park — and that's precisely its charm. Opened in 1992 on the site of the old Citroën car factory, it's a bold, modernist take on urban green space, with geometric themed gardens, two striking glasshouses (one housing tropical plants, the other Mediterranean), and wide lawns that stretch toward the Seine. The centerpiece is the Ballon de Paris, a tethered hot-air balloon that rises 150 meters and gives you one of the best free-ish panoramic views of the city. Kids under 12 (Parisians) ride free, which makes it a no-brainer if you're visiting with family.

What locals really love here is the space. Unlike the tightly packed Luxembourg or Tuileries gardens, André Citroën breathes — you can actually spread out a blanket and not feel like you're sitting on someone's lap. The park's location in the 15th, slightly off the tourist trail, means it's mostly families, joggers, and neighborhood regulars. The themed gardens (each named after a color and a metal) are fun to wander through, and the reflecting pools near the Seine are gorgeous at golden hour.

It's not perfect — some find the modernist design a bit cold compared to Paris's more romantic parks, and the southern edge is bordered by some imposing administrative buildings. But on a sunny afternoon, with the balloon floating overhead and kids running through the fountains, you'll get why this is one of the 15th's best-kept secrets. Go early on weekends to grab a good patch of lawn.