The Church of Santa Maria of Asuncion is one of the most important of the town of Castro Urdiales. Its gothic structure was built way back 13th century. One part of the structure is the two towers leading to a basilical plant. There are three historical ships that are related to the church. Inside the church, one can observe the diverse works of artistic sculptures including the White Virgin of the 13th century, the Christ Yaciente de Gregorio Fernandez of 17th century, and three magnificent gothic statues of Kings Magos of 14th century. One notable detail of the church is the linen cloth off the statue of Christ of the Miracles which is a credited work of Zurbarán.
Just a few walks after the Church of Santa Maria of Asuncion are some marvelous castles that are well preserved by the town. The structures of the castles are likened to those of the town’s churches. The castles are all strategically located at areas of defense. It is patterned to a pentagon, thus forming sharp angular buckets. Just in front of the church is the Roman Miliario, a small square with a great historical significant to the residents of Castro Urdiales.
Luis de Ocharan’s place and castle is an Italian Villa constructed in 1901. It is a proud masterpiece of the revered designer, Eladio Laredo. This marvel is adorned with tile and glass finish and has a prominent porch that comes with exquisite columns. The castle is of the neogothic style of architecture. One can walk this old villa and be fascinated with the historical facts that come along with it.
The Heritage and Medieval bridge of Santa Ana is also an attraction of Castro Urdiales. The renowned hermitage is a rectangular plant with a porch that is uniquely structured with pillars with square sections.
A wood armor is added feature to the tile of the roofs.
The City Council of Castro Urdiales, where most of the town’s festivals and activities are held, is a grand establishment with a protruding balcony and a tower that has a gigantic clock built with it to synchronize the town’s time.
The Monument of Ataulfo Argenta is built in the loving memory of the famous Spanish conductor who was greatly loved during his time. His statue can be visited in the Castro Urdiales garden.
At Peña del Cuco is proof of cave paintings of incalculable value. Located on the coast, to the west of the town, and fronting the bullring, this prehistoric cave contains very fine and highly interesting engravings from the Upper Palaeolithic. Estimated to be around 12,000 years old, the etchings represent goats, deer, and horses.