Buildings
The excavators have divided Ostia into five regions, numbered I to V. Within the regions blocks (insulae) and individual buildings have been distinguished, numbered as follows: (region) I, (block) I, (building) 1, etcetera.
The Topographical Dictionary of the five regions can be accessed in two ways. If you are not yet very familiar with the topography of Ostia, we suggest that you discover the city using the text menu. If you know your way around, then you may prefer to use the clickable plans. Please note however, that some buildings and structures are not recognized easily on the plans. Others are not clickable at all, for example buildings in unexcavated areas, found during recent geophysical research.
Topics
A number of topics is discussed. These will help you to get familiar with a category of buildings, or a subject. So, for example, the topic "Mithraea" includes a short introduction to the cult of Mithras, and a distribution map of and links to all Ostian mithraea.
Tools
In the "Building glossary" you will find a short description of building and decoration techniques: "opus latericium", "opus mixtum", "opus sectile" etcetera. The "Chronological index" contains the dating of Ostian buildings by the excavators, in 1954. Of course recent research has often suggested new dates. Finally, you will find a list of Roman Emperors.