Which city is associated with Martin Luther's 95 Theses?

Wittenberg is closely associated with Martin Luther's 95 Theses because it was in this city that he famously nailed his theses to the door of the Castle Church in 1517. This act is widely recognized as the catalyst for the Protestant Reformation. Luther's 95 Theses criticized the Catholic Church's practices, particularly the sale of indulgences, and called for reform within the church. This moment in Wittenberg marked a significant turning point in European history, leading to a profound transformation in religious practices and beliefs across the continent.

The other cities mentioned do not have the same historical connection to Luther's actions. Berlin, while significant in later German history, was not the center of the Reformation at that time. Leipzig hosted debates related to reformation ideas but was not the birthplace of the 95 Theses. Cologne was an important city in the Catholic Church but is not directly linked to Luther’s key writings or actions. Therefore, Wittenberg remains the definitive location connected to the initiation of significant religious change due to Luther’s 95 Theses.