San Telmo is one of the oldest neighborhoods in Buenos Aires, Argentina, known for its cobblestone streets and vibrant atmosphere. It is famous for its rich history, colonial architecture, and lively markets, particularly the San Telmo Market, which offers a variety of local foods and crafts. The area is also renowned for its tango culture, with numerous street performers and dance halls. Visitors can explore antique shops, art galleries, and enjoy the bustling ambiance during the weekly San Telmo Fair, making it a must-visit destination for both locals and tourists alike.