On weekends and holidays, Argentina’s Government House, popularly known as “La Rosada” (Pink House), offers tourists free half-hour guided tours of a venerable building that underwent many changes over a period of more than 300 years, if the calculation begins with the fort that was built on this spot in 1595. One of the first things that visitors learn from the guide, a San Martín Regiment presidential honor guard soldier in a period uniform, is the real reason why “La Rosada” has always been painted pink. The first group enters the building at 10am, the last at around 7:30pm.