San Telmo ("Saint Pedro González Telmo") is the oldest barrio (neighborhood) of Buenos Aires, Argentina.
It is a well-preserved area of the Argentine metropolis and is characterized by its colonial buildings. Cafes, tango parlors and antique shops line the cobblestone streets, which are often filled with artists and dancers.
A street named the "Illuminated Block" is where many of these important historical buildings can be found.
San Telmo's attractions include old churches (e.g. San Pedro Telmo), museums, food halls and stalls, antique stores and a semi-permanent antique fair (Feria de Antigüedades) in the main public square, Plaza Dorrego.
Tango-related activities for both locals and tourists are in the area.
San Telmo is a pretty tranquil neighbourhood during the week;
most tourists tend to stick around the main square Plaza Dorrego where there are various cafés which double as public seating for the many tango performances on the square.
However, every Sunday, the borough bursts into life with its world-renowned street market.
The Plaza Dorrego and Defensa Street are packed with stalls selling antiques, books and many curiosities, whilst the huge variety of street performers is astounding.