The Virtueller Katalog Kunstgeschichte (VKK) is a specialized search engine based on the technique of the perhaps better-known Karlsruher Virtueller Katalog. It is an initiative of the working group formerly known as AKB, the Arbeitsgemeinschaft der Kunstbibliotheken, comprising the German art libraries funded by the Deutsche Forschungsgemeinschaft. The VKK has functioned since September 1999. Currently, almost all AKB members, in other words the most important German art libraries, are among the target systems. Together, the target systems already offer far more than 1.6 million bibliographic records. The newest participant is the union catalogue of one of the most distinguished art historical networks, the IRIS Consortium in Florence. The VKK, which has just received a new, multilingual interface, is intended to become a gateway to the OPACs of the most important libraries and networks on an international level, and thus a central tool for specialized art historical research. This paper is also an invitation for potential new international partners.