Callejón Zollo

This guide to Callejon Zollo in Bilbao follows a narrow alley off the Alameda San Mames that local kids nicknamed the wolf's mouth, once a cart route feeding the old grain exchange. It traces how the passage closed in on itself over time, becoming a dead-end used by a bakery and later fish sellers who gated it every night. Look down as you walk it: the worn stone still holds the ruts left by cart wheels.