Erfurt Cathedral, also known as St Mary’s Cathedral, is the largest and oldest church building in the Thuringian city of Erfurt, central Germany. The cathedral was mainly built in the International Gothic style and is located on a hillside overlooking the main town square (Domplatz, Cathedral Square), directly next to St Severus’ Church. As a unique architectural ensemble, both churches together form the city’s landmark.

Maria Gloriosa, or the Erfurt Bell, is a well-known bell of Erfurt Cathedral, cast by Geert van Wou in 1497. The world’s largest medieval free-swinging bell, it is now swung electrically. It was welded in 1985 to repair a crack, then, in August 2004, the bell was re-fused due to another crack from 2001.

Erfurt Bell has a diameter of 2,584 mm and weighs 12555 kg. It is about 2 meters tall.

As with any well-tuned bell, the hum tone is near an octave below the strike tone, and all other notes are in tune including the minor third, fifth, octave, and major third and fifth in the second octave that may be heard in large bells.

According to the wikipedia