In the pursuit of making cultural heritage more intellectually accessible to a broader audience, the Greek Cultural Aggregator, SearchCulture.gr, recently underwent a transformation—adding map-based discovery to its services. This paper aims to delve into the methodology of semantic enrichments of spatial metadata using state-of-the-art semantic technologies and to discuss how transforming Searchculture.gr into a portal where geospatial data can be visualized, queried, and interlinked is fostering intellectual accessibility and adding value to cultural data. Furthermore, related initiatives are presented which apply customizable, expert-assisted semantic enrichment strategies with the scope to improve data quality, disambiguation, and multilingual capabilities in cultural heritage collections.