The great orthodox monasteries

List of the great orthodox monasteries in the world

Athos
Saint Catherine's Monastery of Mt Sinai https://www.sinaimonastery.com/index.php/en/
Meteora
Kiev Caves Lavra (Ukraine)
Rila Monastery (Bulgaria)
St. Seraphim-Diveevo Monastery (Russia)
Trinity-St. Sergius Lavra (Russia)
New Jerusalem Monastery (Russia)
Holy Dormition-Pochaev Lavra (Ukraine)
Royal Lavra (Serbia)
Nilo-Stolobenskaya Pustin (Russia)
Solovki Monastery (Russia) UNESCO’s World Heritage List.

Further reading
https://en.wikipedia.org/wiki/List_of_Eastern_Orthodox_monasteries
https://orthochristian.com/94683.html