The towers of the Customs (18th century) were built to flank the passage to the Plaza de la Aduana, where taxes and tolls were collected. These neoclassical buildings are one of the best known and most representative monuments in La Carolina. They wanted to bring a stately architecture to the capital of the New Towns and a revolution to urban planning of the time. In 1792 they were transferred to guard the north entrance of the city. In the original plan of the population it was planned to raise a tower for each vertex of the city.