Palencia Cathedral was built from 1172 to 1504 stands over a low vaulted Visigothic crypt (the Crypt of San Antolín). It is a large Gothic building, popularly dubbed as 'The unknown beauty' because not as well known as other Spanish cathedrals, though, it is a valuable building which has in its interior a large number of works of art of great value.
Its more than 130 metres long, 42 metres high and 50 metres wide at the centre, making it one of the largest cathedrals in Spain and Europe.
Its exterior solid, simple and austere does not reflect the grandeur of its interior, with more than twenty chapels of great artistic and historical interest. The most recognizable on the outside, is the tower, slim but a little rough, considering your Gothic style. Recent studies and excavations show that it was a military tower, and after serving this function were added to their pinnacles and cattail as the sole decoration.
The Cathedral's museum contains a number of important works of art, including a retablo of twelve panels by Juan de Flandes, court painter to Queen Isabella I of Castile and El Greco's St. Sebastian' (1576–79).
References:Trenčín Castle is relatively large renovated castle, towering on a steep limestone cliff directly above the city of Trenčín. It is a dominant feature not only of Trenčín, but also of the entire Považie region. The castle is a national monument.
History of the castle cliff dates back to the Roman Empire, what is proved by the inscription on the castle cliff proclaiming the victory of Roman legion against Germans in the year 179.
Today’s castle was probably built on the hill-fort. The first proven building on the hill was the Great Moravian rotunda from the 9th century and later there was a stone residential tower, which served to protect the Kingdom of Hungary and the western border. In the late 13th century the castle became a property of Palatine Matúš Csák, who became Mr. of Váh and Tatras.
Matúš Csák of Trenčín built a tower, still known as Matthew’s, which is a dominant determinant of the whole building.