At the west end of the town walls, next to the river in a farmyard largely hidden by poplars, this small Romanesque hermitage was founded on the site where the remains of St. Secundus (a follower of St. Peter) were reputedly discovered. It has a realistic-looking marble monument to the saint, carved by Juan de Juni. Inside, a trio of arches and naves symbolizes the Christian trinity—but is rumored to actually be an architectural error. The chapel's caretaker doesn't always adhere to posted visiting hours, and you may have to ask for a key in the adjoining house. Still, it's worth the walk for a look outside.
Pl. de San Segundo s/n, Ávila, 05002, Spain