Final answer:
Catholic religious complexes built throughout Europe in the Middle Ages were called cathedrals, which were constructed in the Romanesque and Gothic styles.
Step-by-step explanation:
In the Middle Ages, Catholic religious complexes built throughout Europe were called cathedrals. These cathedrals were constructed in two architectural styles: Romanesque and Gothic.
Romanesque cathedrals, built in the 10th and 11th centuries, were characterized by thick walls, round arches, and large towers. On the other hand, Gothic cathedrals, built from the 12th to the 16th centuries, had thinner walls with large windows, pointed arches, and flying buttresses.
Examples of these religious complexes include Notre-Dame Cathedral in Paris, Salisbury Cathedral in England, and Cologne Cathedral in Germany.