Picturesque Colonia del Sacramento is one of the main gateways into Uruguay from Argentina. Only 1 hour away from Buenos Aires by boat, its tranquil old town has been awarded UNESCO world heritage status. Founded by the Portugese in 1680, it was of strategic importance due it being placed on the tip of the north peninsula of the Río de la Plata. Its most famous street, Calle de los Suspiros (Street of Sighs), has two equally interesting theories on how it got its name. One story states that prisoners who were convicted to death were led up the street to be tied up and drowned when the tide came in. Another claims that the sighs refer to the sounds of the many brothels that were allegedly located on the street.