Palais de Tokyo is Europe's largest contemporary art center, but it feels nothing like a traditional museum. Housed in a raw, stripped-back concrete building from the 1937 World's Fair, it stays open until 10 PM most nights and midnight on Thursdays, drawing night owls into sprawling industrial halls filled with rotating installations, graffiti murals, and performance art. The marble esplanade doubles as a skate park with Eiffel Tower views, while underground passages hide the ever-evolving Lasco street art project.