St. Stephen's Cathedral in Vienna is a hall church.

A hall church is a type of church building. The term "hall church" is about the architecture of the building. Most very large churches and cathedrals are built with a long part where people sit, called the "nave". On each side of the nave is a lower "aisle". Between the nave and the aisles are rows of columns. Above the columns are windows which let light into the nave. In a hall church, there are no windows above the columns. The nave and the aisles are about the same height.