During the 18th century and part of the 19th, the Yatasto locality was the main mail and passenger post for travellers moving between Salta and Tucumán. The Yatasto hacienda was established in the area in the 18th century, property of Francisco Toledo, and it reached its peak splendour during that period with 5000 heads of cattle. Years later, during the 19th century, it was the residence of Coronel don Vicente de Toledo Pimentel.

It is located in the surrounding area of Rosario de la Frontera, two kilometres away from the city of Metán, and 150 kilometres from Salta, along the Ruta Nacional Nº 34 National Route, leading to San Miguel de Tucumán.

General Juan Martín de Pueyrredón positioned his encampment in here on the 10th of March of 1812, after retreating from Alto Perú (currently Bolivia). The 26th of that same month he transferred the army's command post to General Manuel Belgrano. According to tradition, the meeting between Generals San Martín and Belgrano took place at this post, when the former assumed the control of the army on the 30th of January of 1814.

The hacienda house, which has remained until the present time, dates back to the end of the 18th century or the early years of the 19th. Actually, it was originally part of the "sitting room" of the old hacienda house. Though it served as a post, the opening of new roads and the development of new ways of communications and transportation relegated it back to agricultural and stockbreeding activities.

The building has two very differentiated stories: the ground floor, with various adjacent rooms faces a gallery with wooden pillars and a low roof that ends at a room protruding towards the front. On the other side, there is a room with a view of the valley from an extended balcony, similar to those seen in the city of Salta.

It is currently used as a museum, and holds a reconstruction of a rural house of that time period. It has been declared a National Historical Monument.