Located just a short walk from Retiro subway station, Puerta de Alcalá is one of Madrid's most iconic landmarks. This neoclassical triumphal arch was built in the late 18th century and serves as a grand entrance to the city. With its impressive architecture and historical significance, Puerta de Alcalá is a popular spot for tourists to take photos and admire the city's beauty. Surrounding the arch, you'll find a bustling square filled with cafes, shops, and street performers, making it a vibrant and lively area to explore.