Europe in ancient times there are several floors of buildings, but which era did not have cement, steel how did they do it?

In fact, as early as three or four hundred years ago, China has found a way to fix the bricks in the building, such as in the present Xi'an can see that kind of construction method. Specifically by using boiled glutinous rice with other building materials, it was possible to achieve the current strength of concrete.

And Romanesque architecture is the Gothic architecture of the 12th-15th century in Western Europe, centered in France, when Europe had already created a building material similar to cement, which they used to create towering churches.

Current domestic construction methods are mostly passed on from Europe. Let's just say that the current Chinese civilization is relatively less accomplished than the ancient Chinese civilization.