The Castillo de Santa Bárbara sits on top of the Guanapay volcanic cone, a kilometre or so southeast of the village. The fortress is small — a single rectangular keep, a few cannons, a parade ground — but it has a commanding view in every direction, which is exactly why it was built here in the 1500s. From the battlements you can see the whole north of Lanzarote: Teguise below, the patchwork of vineyards in La Geria, the dark cones of Timanfaya on the horizon, and on a clear day the silhouette of Fuerteventura to the south.
Inside, the castle now houses the Museo de la Piratería — the Museum of Piracy — a small but well-presented collection telling the long story of corsair raids on the Canary Islands. There are maps, weapons, model ships, and rooms set up to evoke prison cells and powder magazines. Allow about an hour. The road up is steep and unpaved in places; a regular car will manage it in dry weather, but a 4×4 or a determined walk is a better idea.