On May 28, 2004, a plenary session of the International Scientific Conference "Hillforts, Castles, Estates on the Ancient Lands of the Zamosc Region and Volyn" was held at the Volyn Museum of Local Lore, organized by the Zamoyski Museum in Zamosc (Republic of Poland) and the Volyn Museum of Local Lore in Lutsk. The conference takes place from May 27 to 29 in Zamosc and Lutsk and includes two plenary sessions (at the Zamoyski Museum — 27.05 and at the Volyn Museum of Local Lore — 28.05). More than 50 researchers from Lutsk, Lyuboml, Ostroh, Warsaw, Zamosc, Torun, Lublin, Krakow, and Tarnow are participating in it. The program includes the opening of an exhibition at the "Arsenal" Museum (Zamosc), and familiarization with monuments of fortification art in Zamosc, Volodymyr-Volynskyi, and Lutsk. Participants and guests of the conference will be able to view the castles in Dubno, Kremenets, Zbarazh, and Olesko. The conference will conclude in Lviv. The materials and reports of scholars delivered at the conference will be published in the second volume of the "Zamosc-Volyn Museum Notebooks."