Pskov-Pechory Monastery of the caves, view from a tourist overlook. Pechory, Russia, August 8, 2004
Caves and springs on a bank of a creek in Rozhdestveno, 50 miles south from Saint Petersburg. Russia, August 22, 2004
Cave Cathedral of Pokrovo Tervenichi Women s Christian Orthodox Monastery. Area of Lodeynoe Pole, Leningrad Region, Russia, August 4, 2012
Blizhniye ("nearby") caves of Pskov-Pechory Monastery. Pechory, Russia, August 8, 2004
Cave Cathedral of Kievo Pechory Saints in Pokrovo Tervenichi Women s Christian Orthodox Monastery. Area of Lodeynoe Pole, Leningrad Region, Russia, August 4, 2012
Underground river Poneretka emerging from a cave and meeting Msta River near Borovichi. Novgorod Region, Russia, July 3, 2016
Mouth of underground river Poneretka emerging from a cave and meeting Msta River near Borovichi. Novgorod Region, Russia, July 3, 2016
Underground river Poneretka emerging from a cave and meeting whitewater area of Msta River near Borovichi. Novgorod Region, Russia, July 3, 2016
Stream of underground river Poneretka emerging from a cave and meeting Msta River near Borovichi. Novgorod Region, Russia, July 3, 2016