Not to be confused with the historic but stuffy Rotonde in Montparnasse, this huge, round 18th-century pavilion sits at the southern end of the Bassin de La Villette on place Stalingrad. It originally served as a giant toll-booth (a barrière d’octroi), when "foreign" merchants were obliged to pay a tax to sell their goods in Paris. Today, it houses a restaurant, a wine bar/beer garden/tearoom (Le Refuge), and on warm days, a delightful terrace where you can sip in the sun.