This is a picture of a model of the city of Vienna in the 1400's.  In the center, you can make out the Stefansdom (St. Steven's Cathedral).  For centuries, it was the second tallest building in the world, next to the Cheops Pyramid in Giza.  However, it was only shorter by about 3 meters.  Now, it is the second tallest cathedral in the world, second to the cathedral in Ulm, Germany, which was finished in 1890.  Stefansdom was built beginning in 1304, and was finished in 1555.  that's over 250 years!  As you can see, it was a central part of the city.  It still is a major landmark within the city.  

Here you can see a picture I took of the main tower of the Stefansdom.  It is beautiful, built in the Gothic style.  The second tower was never finished, because the Gothic style of architecture went out of style!