Alegranza is the northern outlier of the Chinijo Archipelago, a dry volcanic island with a lighthouse, low cones, and cliffs that feel a long way from the small harbour life of La Graciosa. It is uninhabited and protected, so the appeal is not beach facilities but the sense of the Canaries before roads and resort edges arrived.
You normally see it by boat rather than as a casual landing, and conditions matter. For travellers based on La Graciosa, it is a good reminder that the island is part of a wider marine reserve: look for seabirds, the pale volcanic slopes, and the way the Atlantic opens up beyond the sheltered strait.