The peaceful city of La Serena has a few nice colonial churches to visit. Some of them date back to the 16th century. All of them are located within walking distance of Plaza de Armas in the city center.
Iglesia de Santo Domingo
About a half block to the west of Plaza de Armas is Iglesia de Santo Domingo. My favorite feature is the bell tower. The church was built in the late 17th century.
Iglesia de La Merced
A block east of the plaza is Iglesia de La Merced. The original church was burned down in 1680 by English pirate Bartholomew Sharp and a new one was built in the early 1700s.
Iglesia de San Agustín
Two blocks east of there at the end of Calle Arturo Prat is the Iglesia de San Agustín. It was built in 1672.
Iglesia de San Francisco
Finally, to the southwest of Plaza de Armas in La Serena is the Iglesia de San Francisco, which was built between 1585 and 1627.