The Neptune Fountain was created in the second half of the 18th century. It depicts a character from Roman mythology - the mighty god of water and rain riding a chariot, accompanied by two mounts half immersed in water. His attribute is the trident. The designer in the neoclassical style was architect Ventura Rodríguez.
The construction of the fountain was part of the city's revitalization plan, which was ordered by King Charles III. He wanted Madrid to be as impressive a metropolis as it was then Paris or St. Petersburg. Many sculptors worked on the implementation of the fountain design. The work began with Juan Pascual de Mena, after his death they continued their work, including his student José Arias and José Rodríguez.
The group of sculptures was made of white marble from Toledo. Today, the square around the fountain is a meeting place for fans of the Atlético Madrid football club, they traditionally celebrate all their team's victories here.