The monuments of the state capital Mainz are listed in an informative monument register maintained by the monument authority, the General Directorate for Cultural Heritage, Directorate for State Monument Preservation. The basis for the monument list is the city's monument topography, which has been published since 1986 and, in addition to the individual cultural monuments, also provides a brief historical overview of the city's development. The monument topography comprises three volumes:

• Volume 2.1 - City expansions of the 19th and early 20th centuries
• Volume 2.2 - Old Town
• Volume 2.3 - Suburbs

The three volumes are available from bookshops or the monument authority. They can also be viewed in the open access section of Mainz City Library.

Under the motto "Historical Mainz," information boards and steles provide information on numerous historically significant and culturally valuable buildings, monuments, and locations. They explain a wealth of interesting facts about the history of the buildings, their uses, architects, and clients to visitors to the city, in some cases using specially produced plans and drawings.

The preservation and maintenance of our cultural heritage is regulated by the Monument Protection Act (DSchG). The contact for this is the lower monument protection authority in the building authority, monument preservation department, of the state capital Mainz.

The people of Mainz are proud of their monuments and do a lot to preserve them. Among others, the Mainz Monument Network, an initiative of Mainz residents together with the Mainz Local Board of Trustees of the German Foundation for Monument Protection, and the Mainz Citadel Initiative are committed to preserving the city's cultural monuments.

The lecture series, which has been held annually by the city of Mainz since 1995, offers an exciting overview of the most significant monument projects of the year in the city area. In addition to the lower monument protection authority of the city of Mainz, other monument authorities such as the state monument preservation authority, the state archaeology authority, and the church monument preservation authority also regularly report on their areas of activity, depending on current projects. The focus is usually on recently completed projects and excavations, the scientific findings from these, and measures currently in progress.   

With almost 1,000 protected individual monuments, large excavation protection areas, and numerous historic monument zones and architectural complexes, Mainz offers an exciting variety of historical buildings despite the devastating destruction it suffered during World War II, providing a wide range of exciting insights every year. 

Open Monument Day is a nationwide event that takes place annually on the second Sunday in September and has been coordinated by the German Foundation for Monument Protection since 1993. On this day, numerous cultural monuments throughout Germany are opened to interested visitors, allowing the public to experience them. Open Monument Day is a registered trademark of the German Foundation for Monument Protection. Anyone wishing to participate in Open Monument Day can register their program with the German Foundation for Monument Protection by May 31 each year. The requirements for participation can be found on the website www.tag-des-offenen-denkmals.de.

Every year in Mainz, numerous citizens and initiatives are involved in making cultural monuments accessible on this day in order to bring the history of the city of Mainz to life. The lower monument protection authority of the city of Mainz also regularly offers guided tours and information for citizens on the respective key topics as part of this day of action. 

As a contribution to Open Monument Day, the monument authority of the General Directorate for Cultural Heritage has been organizing the Rhineland-Palatinate Monument Day annually since 2018.