In my opinion, San Telmo is the most beautiful district in Buenos Aires. It is filled with wonderful sites, old buildings, great graffiti murals, amazing shopping, cafes, restaurants, ice cream shops, souvenir shops. It is the home of the Ferria De San Telmo, which is an incredible display of local arts, antiques, and much more. You can catch tango dancers here, especially on weekends. The cobblestone streets and antique look of the area make it all a really delightful experience.