Colonia del Sacramento is a city in southwestern Uruguay, across the Río de La Plata from Buenos Aires. It's known for its cobblestoned Barrio Histórico, lined with buildings from its time as a Portuguese settlement. Set above the historic district is the 19th-century Colonia del Sacramento Lighthouse, offering sweeping river views. Nearby lies the Portón de Campo, remnants from the old city walls.

On the east bank of the Río de la Plata, 180km west of Montevideo, but only 50km from Buenos Aires by ferry, Colonia is an irresistibly picturesque town enshrined as a Unesco World Heritage site. Its Barrio Histórico, an irregular colonial-era nucleus of narrow cobbled streets, occupies a small peninsula jutting into the river. Pretty rows of sycamores offer protection from the summer heat, and the riverfront is a venue for spectacular sunsets (it's a Uruguayan custom to applaud the setting sun). Colonia’s charm and its proximity to Buenos Aires draw thousands of Argentine visitors; on weekends, especially in summer, prices rise and it can be difficult to find a room.