Oliva Bordering on the province of Alicante, Oliva is the second most important town in the region of La Safor.
Olivenza By rule of the 1297 Alcañices Treaty, Olivenza belonged to Portugal until 1801. Both Spanish and Portuguese monuments were restored thanks to a municipal initiative.
Olot It is the capital of the region of Garrotxa. The medieval buildings that made up this town were destroyed in the 1427 and 1428 earthquakes. At present, the most remarkable feature of the city is its intense cultural and artistic life.
Olvera One of the most characteristic towns in the mountains of Cadiz. Set atop a spur, the whiteness of its houses reflects the splendour of the sun of Andalusia.
Oña A remarkable village since the times of Fernán González, it grew under the protection of the monastery of San Salvador and the grace of the monarchs.
Oñati Located at the heart of peninsular Euskadi (the Basque Country), this town takes up a beautiful valley surrounded by green mountains on all sides except the southern one, where the giant Aloña limestone formation sits.
Onda In the spurs of Sierra Espadán we find Onda, a historic village in the interior of Castellón, which holds an important monumental heritage, and has a long tradition in the production of ceramics.
Ondarroa Ondarroa is a fishing and canning port. At the top of town, the church of Santa María and the Likona Tower are its chief characteristics.
Ontinyent The town of Ontinyent is about 82 kilometres from the city of Valencia. Its old town has been declared Property of Cultural Interest. Its unique aesthetic is due to the contrast resulting from its stately 18th century mansions and the more modest Valencian buildings from the late 18th century and early 19th century.
Orgiva Órgiva, the administrative and economic capital of the western side of the region of Alpujarra, has managed to combine in its urban development both a modern life style, and a rich historical heritage that reached our days almost intact.
Orihuela Orihuela offers the visitor a great place to enjoy the sea and sun, a monumental city centre, and three excellent eighteen-hole golf courses.
Orio Orio is a small fishing town in the province of Guipuzkoa, set in a privileged location. Its old town has the Property of Cultural Interest designation.