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Olvera Castle is one of the most iconic monuments in the White Villages of Cádiz, offering a stunning historical and visual experience. It was built in the late 12th century by the Arabs as part of the defensive system of the Nasrid Kingdom of Granada. After the Christian conquest, the castle was renovated several times, incorporating Christian architectural elements. It was declared a Site of Cultural Interest in 1985 and is part of the Olvera Historic-Artistic Complex.

The Castillo de Olvera is a historic fortress in the Andalusian town of Olvera (province of Cádiz). It was built by the Moors in the late 12th century and served as part of the defense system of the Nasrid Kingdom of Granada. The castle sits atop a 623-meter-high cliff and offers sweeping views of the surrounding landscape. The castle has an irregular, elongated-triangular floor plan that follows the shape of the cliff. Particularly striking is the rectangular Torre del Homenaje (Keep) in the southern part of the complex. It has two stories with barrel vaults and was the central element of the defense. Other features of the fortress include a barbican-protected entrance gate, battlements, towers, an underground vault, and two cisterns for the water supply. After its conquest by Castilian troops under King Alfonso XI in 1327, the Moorish fortress was extensively rebuilt. This is where many of the Christian elements visible today were created. Since 1985, the Castillo de Olvera has been listed as a "Bien de Interés Cultural" (Cultural Property of Special Interest). Opening Hours: Summer (approx. April–October): Tuesday to Sunday, 10:30 a.m.–2:00 p.m. & 4:00 p.m.–7:00 p.m. Winter (approx. November–March): Tuesday to Sunday, 10:30 a.m.–2:00 p.m. & 4:00 p.m.–6:00 p.m. Closed on Mondays Admission: €2 per person. Tickets are available at the Tourist Office. (As of May 2025)

Amazing views over the valley of Algodonales

An entrance fee is €2 and a visit certainly does not take long. The bike can wait in the bike rack.

Hostal Estación Vía Verde is located 1 km from the centre of Olvera, via Calle Estación (next to the bus station) to Vía Verde de la Sierra. It is an old train station that has been rehabilitated as a hotel-restaurant and is part of the Sierra Greenway. It has 6 bedrooms, all with bathrooms. In addition to the restaurant and accommodation, bicycles can be rented.

Railway Tunnel No. 1 of the Sierra Greenway Nature Trail. This tunnel crosses an outcrop of sandstone and marl to maintain the gradient of the railway line. This outcrop will be crossed by the following four tunnels. It is 170 meters long and is equipped with lighting; however, a flashlight is recommended. The tunnels in this railway section were constructed using shoring (supporting the excavation) with wooden beams and props, followed by formwork for the concrete slab that supports the tunnel. The tunnel entrance is finished with hewn limestone from a quarry located opposite Zaframagón.

Railway tunnel no. 2 of the Sierra Greenway Nature Trail. Located 560 meters from the previous tunnel, it is 60 meters long and has no artificial lighting, so a flashlight is recommended. This tunnel passes through an outcrop of marl and sandstone. The tunnels in this railway section were constructed using shoring (supporting the excavation) with wooden beams and props, followed by formwork for the concrete slab that supports the tunnel. The tunnel entrance is finished with hewn limestone from a quarry located opposite Zaframagón.

Railway Tunnel No. 3 of the Sierra Greenway Nature Trail. Located 505 meters from the previous tunnel, it is 70 meters long and has no artificial lighting, so a flashlight is recommended. This tunnel passes through an outcrop of marl and sandstone. The tunnels in this railway section were constructed using shoring (supporting the excavation) with wooden beams and props, followed by formwork for the concrete slab that supports the tunnel. The tunnel entrance is finished with hewn limestone from a quarry located opposite Zaframagón.