There's the "Ulmer Münster" and this church is one of the most often visited protestant churches in this country, located in Ulm, Baden-Württemberg, Germany.
There is no exact data on the annual number of visitors but the aproximate number is between 550.000 and 750.000 visitors. In Germany this church is the sixt most often visited protestant church in Germany, based on a research from 2013 found on www.ChristTV.de
The Minster is the tallest church in the world, and the 4th tallest structure built before the 20th century, with a steeple measuring 161.5 metres (530 ft) and containing 768 steps. From the top level at 143 m (469 ft) there is a panoramic view of Ulm in Baden-Württemberg and Neu-Ulm in Bavaria and, in clear weather, a vista of the Alps from Säntis to the Zugspitze. The final stairwell to the top (known as the third Gallery) is a tall, spiraling staircase that has barely enough room for one person.
source: [DE] Wikipedia