Lake Seliger
The district contains 187 cultural heritage monuments of federal significance (125 of them located in Ostashkov) and additionally 287 objects classified as cultural and historical heritage of local significance (118 of them in Ostashkov). Essentially, the whole center of Ostashkov consists of listed buildings. Other federal monuments include the Nilova Pustyn monastery, located on an island on Lake Seliger, the Novyye Yeltsy Estate in the selo of Novyye Yeltsy, as well as a number of churches in the villages of the district and several acheological sites.