A ruined house in the citadel marks the spot where, according to a stubborn local tradition, Christopher Columbus was born. The evidence is thin to nonexistent, but the plaque is there, the story is told, and the row of stone arches and worn doorways is genuinely old.
Whatever the truth, the ruin makes a small detour worth taking — the alley is one of the quieter corners of the citadel and gives a sense of how cramped the place once was.