This is one of the most well-known monuments in Madrid. Built between 1769 and 1778 under the orders of King Carlos III, it was designed by Francisco Sabatini and erected as a triumphal arch to celebrate the arrival of the monarch at the capital. The granite gate is 19.5 metres tall and is elegant and well-proportioned. The façade features a number of decorative elements with groups of sculptures, capitals, reliefs and masks, among others.