Colonia del Sacramento is a historic city located in southwestern Uruguay on the banks of the Río de la Plata. Situated directly across from Buenos Aires, Argentina, it serves as the capital of the Colonia Department and is one of the oldest towns in the country. The city was established in 1680 by Portuguese explorers as a strategic colony and underwent numerous changes in ownership between Portuguese and Spanish forces over several centuries before becoming part of Uruguay.
The town is recognized as a UNESCO World Heritage Site, primarily due to its well-preserved Barrio Histórico (Historic District). This area features a blend of Portuguese and Spanish colonial architecture characterized by pastel-colored buildings, terracotta tile roofs, and narrow cobblestone streets. Notable landmarks within the district include the 17th-century Portón de Campo city gate, the Basilica del Santísimo Sacramento—believed to be one of Uruguay's oldest churches—and the ruins of the Convent of San Francisco.
The city is also known for its distinct atmosphere, featuring a variety of museums, art galleries, and artisan shops. Notable landmarks include El Faro, a lighthouse built in the mid-1800s that offers views over the river, and several historic houses such as the Casa de Nacarello. Its strategic location at the mouth where the river meets the Atlantic Ocean has made it a significant cultural and historical site for centuries.