The archaeological background of Modrá is particularly important. The hillside was occupied in several historical periods before the arrival of the Slavs. Archaeological research later revealed the remains of a Great Moravian settlement and an early medieval church. Research on the church began in the early 20th century, while later excavations helped establish its connection with the Great Moravian period.

The present open-air museum was created as a reconstruction based on archaeological evidence. Its buildings are not original surviving structures, but historically informed reconstructions whose dimensions, construction principles and interiors are based on archaeological discoveries from Modrá and other important Great Moravian sites in the Uherské Hradiště region.

Visitors can explore several parts of the settlement, including fortifications, dwellings, workshops, agricultural buildings and the reconstructed palace of a Great Moravian ruler. A separate ecclesiastical and educational area includes a reconstructed church and buildings associated with early Christian and educational activities. The site also includes the underground Treasury of Great Moravia, displaying archaeological finds connected with the elites of the Great Moravian period.

The museum brings the past to life through demonstrations of traditional crafts, historical events, educational programmes and activities for schools and families. Visitors can encounter craftspeople in period clothing, learn about early medieval technologies and experience aspects of everyday life in Great Moravia.

Modrá is particularly valuable in the context of the Cyril and Methodius heritage because it presents the historical environment in which Christianity, literacy, education and Slavic culture developed in 9th-century Moravia. Together with nearby Velehrad, Staré Město and other archaeological sites, it forms an important part of the Great Moravian heritage landscape of the region.