Great St. Martin Church is a prominent Romanesque Catholic church located in Cologne's Old Town. It is one of the city’s most recognizable buildings, with its large tower and unique trefoil design. It is most admired for its architecture and peaceful interior. The Roman remains under the church give a glimpse into Cologne’s long history. Inside, the church is simple but impressive, with high ceilings and stone walls.
The church was constructed between 1150 and 1250 atop remnants of Roman warehouses, which are still visible today. The interior is characterized by minimalist furnishings, allowing the building's structure to take center stage. Beneath the choir, archaeological excavations reveal a seamless transition from Roman foundations to medieval church walls, offering a tangible connection to the past.