Spanish architecture refers to architecture in any area of what is now Spain, and by Spanish architects worldwide. The term includes buildings which were constructed within the current borders of Spain prior to its existence as a nation, when the land was called Iberia, Hispania, or was divided between several Christian and Muslim kingdoms. Spanish architecture demonstrates great historical and geographical diversity, depending on the historical period. It developed along similar lines as other architectural styles around the Mediterranean and from Central and Northern Europe, although some Spanish constructions are unique. A real development came with the arrival of the Romans, who left behind some of their most outstanding monuments in Hispania. The arrival of the Visigoths brought about a profound decline in building techniques which was paralleled in the rest of the former Roman Empire. The Muslim conquest in 711 CE led to a radical change and for the following eight centuries there were great advances in culture, including architecture. For example, Córdoba was established as the cultural capital of its time under the Umayyad dynasty. Simultaneously, Christian kingdoms such as Castile and Aragon gradually emerged and developed their own styles, at first mostly isolated from other European architectural influences, and soon later integrated into Romanesque and Gothic and Renaissance streams, they reached an extraordinary peak with numerous samples along the whole territory. There were also some samples of Mudéjar style, from the 12th to 16th centuries, characterised by the blending of Romanesque, Gothic and Renaissance architectural styles with constructive, ornamental, and decorative motifs derived from those that had been brought to or developed in Al-Andalus. Towards the end of the 15th century, and before influencing Latin America with its Colonial architecture, Spain itself experimented with Renaissance architecture, developed mostly by local architects. Spanish Baroque was distinguished by its exuberant Churrigueresque decoration and the most sober Herrerian style, both developing separately from later international influences. The Colonial style, which has lasted for centuries, still has a strong influence in Latin America. Neoclassicism reached its peak in the work of Juan de Villanueva and his disciples. The 19th century had two faces: the engineering efforts to achieve a new language and bring about structural improvements using iron and glass as the main building materials, and the academic focus, firstly on revivals and eclecticism, and later on regionalism. The arrival of Modernisme in the academic arena produced figures such as Gaudí