Beneath the constant noise of the M-30, amid the traffic circling Madrid and the Puerta de Hierro underpass, lies one of the capital’s most unusual places of worship. The Chapel of Santo Domingo de la Calzada, popularly known as the Capilla del Puente, is located inside a 35-meter tunnel built beneath the highway.
At first glance, it’s hard to imagine that behind an unassuming entrance near Avenida de Fuentelarreyna lies a place of worship that is still in use today. But indeed, in this vaulted space—with barely any natural light and the austere appearance of a modern-day catacomb—Masses are still celebrated every day.
It began as a temporary solution
Its history began in the 1970s, when the Fuentelarreina area was expanding and the neighborhood needed a space to hold religious services. A tunnel that had been left beneath the current M-30 was then repurposedto temporarily house the Parish of the Baptism of the Lord.
The first Mass was celebrated on December 19, 1976, and the church was consecrated shortly thereafter. The chapel was permanently established in the tunnel sometime between 1977 and 1978.
Over time, the Parish of the Baptism of the Lord moved to a new location. However, the neighbors wanted to keep that unique space under the highway open. Thus was born the current Chapel of Santo Domingo de la Calzada, which does not belong to any specific religious order and remains linked to the Parish of the Baptism of the Lord.
The chapel survived water seepage
The chapel did not always look the way it does today. The main challenge of occupying a tunnel beneath a major thoroughfare has been water: for years, leaks affected the interior every time it rained.
The chapel was renovated in 2013 to address these waterproofing issues and better adapt the space. The renovation preserved the character of the vaulted ceiling and the site’s unique layout, while improving protection against the moisture that threatened the chapel’s daily use.
Even today, stepping inside still evokes a strange sensation: thousands of vehicles pass over the vault every day, while inside, the silence of a place meant for prayer and contemplation remains undisturbed.