Mega Spilaio (monastery) built
362 CE.
Shown on the map at 38.090°, 22.175°.
Mega Spilaio (Greek: Μέγα Σπήλαιο, lit. 'Great Cave'), formally the Monastery of the Dormition of the Theotokos (Ιερά Μονή Κοιμήσεως της Θεοτόκου), is a Greek Orthodox monastery in the municipality of Kalavryta, in the Peloponnese peninsula in southern Greece.
Text from the Wikipedia article Mega Spilaio, licensed CC BY-SA 4.0.