The Iberian Peninsula
Fortified towns, gardens made for drought.

Castillo de Nogalte
Puerto Lumbreras — Spain
Castillo de Nogalte is a château at Puerto Lumbreras, Region of Murcia, in Spain. Its architecture is recorded as Islamic architecture. The register records it as “bien de interés cultural”. Details are drawn from Wikidata.

Castillo de Obano
Luna — Spain
Castillo de Obano is a château at Luna, Aragon, in Spain. Its architecture is recorded as Romanesque art. The register records it as “bien de interés cultural”. Details are drawn from Wikidata.
- Object type under review
Castillo de Ocelló (Castillo del Saio)
Santa Margarida de Montbui — Spain
Castillo de Ocelló (Castillo del Saio) is a château at Santa Margarida de Montbui, Catalonia, in Spain. Its architecture is recorded as vernacular architecture. The register records it as “bien de interés cultural”. Details are drawn from Wikidata.
Castillo de Odén
Odèn — Spain
Castillo de Odén is a château at Odèn, Catalonia, in Spain. Its architecture is recorded as vernacular architecture. The register records it as “bien de interés cultural”. Details are drawn from Wikidata.

Castillo de Ódena
Òdena — Spain
Castillo de Ódena is a château at Òdena, Catalonia, in Spain. Its architecture is recorded as Romanesque architecture. The register records it as “bien de interés cultural”. Details are drawn from Wikidata.

Castillo de Ofegat
Tàrrega · Province of Lleida — Spain
Castillo de Ofegat is a château at Tàrrega, Catalonia, in Spain. Its architecture is recorded as Romanesque architecture. The register records it as “bien de interés cultural”. Details are drawn from Wikidata.
Castillo de Oix Castillo de los Barutell)''
Oix · Comarques Gironines — Spain
Castillo de Oix Castillo de los Barutell)'' is a château at Oix, Catalonia, in Spain. The recorded building campaign dates from the 15th century. Its architecture is recorded as Gothic architecture. The register records it as “bien de interés cultural”. Details are drawn from Wikidata.
Castillo de Olite
Olite/Erriberri — Spain
Castillo de Olite is a château at Olite/Erriberri, in Spain. The recorded building campaign dates from the 13th century. Its architecture is recorded as Gothic architecture. The register records it as “bien de interés cultural”. Details are drawn from Wikidata.

Castillo de Olivella
Olivella — Spain
Castillo de Olivella is a château at Olivella, Catalonia, in Spain. Its architecture is recorded as Romanesque architecture. The register records it as “bien de interés cultural”. Details are drawn from Wikidata.
Castillo de Olocau
Olocau del Rey — Spain
Castillo de Olocau is a château at Olocau del Rey, Valencian Community, in Spain. Its architecture is recorded as medieval architecture. The register records it as “bien de interés cultural”. Details are drawn from Wikidata.
Castillo de Olorda
Vallvidrera, el Tibidabo i les Planes · Àmbit metropolità de Barcelona — Spain
Castillo de Olorda is a château at Vallvidrera, el Tibidabo i les Planes, in Spain. Its architecture is recorded as Gothic architecture. The register records it as “bien de interés cultural”. Details are drawn from Wikidata.
Castillo de Olost
Oristà — Spain
Castillo de Olost is a château at Oristà, Catalonia, in Spain. The recorded building campaign dates from the 16th century. Its architecture is recorded as vernacular architecture. The register records it as “bien de interés cultural”. Details are drawn from Wikidata.
Castillo de Olsón
Aínsa-Sobrarbe — Spain
Castillo de Olsón is a château at Aínsa-Sobrarbe, Aragon, in Spain. The recorded building campaign dates from the 11th century. The register records it as “bien de interés cultural”. Details are drawn from Wikidata.

Castillo de Orcau
Isona i Conca Dellà — Spain
Castillo de Orcau is a château at Isona i Conca Dellà, Catalonia, in Spain. The recorded building campaign dates from the 11th century. Its architecture is recorded as Romanesque architecture. The register records it as “bien de interés cultural”. Details are drawn from Wikidata.
Castillo de Orenga
Vilanova de Meià · Province of Lleida — Spain
Castillo de Orenga is a château at Vilanova de Meià, Catalonia, in Spain. Its architecture is recorded as Romanesque architecture. The register records it as “bien de interés cultural”. Details are drawn from Wikidata.

Castillo de Orpí
Orpí — Spain
Castillo de Orpí is a château at Orpí, Catalonia, in Spain. Its architecture is recorded as Romanesque art in Catalonia. The register records it as “bien de interés cultural”. Details are drawn from Wikidata.
Castillo de Orríols
Orriols · Comarques Gironines — Spain
Castillo de Orríols is a château at Orriols, Catalonia, in Spain. Its architecture is recorded as Renaissance architecture. The register records it as “bien de interés cultural”. Details are drawn from Wikidata.
Castillo de Orrit
Tremp — Spain
Castillo de Orrit is a château at Tremp, Catalonia, in Spain. Its architecture is recorded as vernacular architecture. The register records it as “bien de interés cultural”. Details are drawn from Wikidata.

Castillo de Os de Balaguer
Os de Balaguer · Province of Lleida — Spain
Castillo de Os de Balaguer is a château at Os de Balaguer, Catalonia, in Spain. The recorded building campaign dates from the 17th century. The register records it as “bien de interés cultural”. Details are drawn from Wikidata.
- Object type under review
Castillo de Otonel
Cortes de Pallás — Spain
Castillo de Otonel is a château at Cortes de Pallás, Valencian Community, in Spain. Its architecture is recorded as medieval architecture. The register records it as “bien de interés cultural”. Details are drawn from Wikidata.
Castillo de Palafolls
Palafolls — Spain
Castillo de Palafolls is a château at Palafolls, in Spain. Its architecture is recorded as Romanesque architecture. The register records it as “bien de interés cultural”. Details are drawn from Wikidata.

Castillo de Palau Sabardera
Palau-saverdera — Spain
Castillo de Palau Sabardera is a château at Palau-saverdera, Catalonia, in Spain. Its architecture is recorded as vernacular architecture. The register records it as “bien de interés cultural”. Details are drawn from Wikidata.

Castillo de Palau Sardiaca
Palau de Santa Eulàlia — Spain
Castillo de Palau Sardiaca is a château at Palau de Santa Eulàlia, Catalonia, in Spain. Its architecture is recorded as Gothic architecture. The register records it as “bien de interés cultural”. Details are drawn from Wikidata.
Castillo de Palau-Sacosta
Girona — Spain
Castillo de Palau-Sacosta is a château at Girona, Catalonia, in Spain. The recorded building campaign dates from the 15th century. Its architecture is recorded as Gothic architecture. The register records it as “Cultural Asset of National Interest”. Details are drawn from Wikidata.