Sanahin Monastery is a medieval monastic complex located in the Lori Province of Armenia, near the town of Alaverdi. It was founded in the 10th century and served as a spiritual and educational center of the Armenian Apostolic Church.

The complex consists of several churches and other structures, including the main church of St. Astvatsatsin, built in the 10th century and expanded in the 13th century, the smaller church of St. Gregory, built in the 13th century, a bell tower, and a library building. The architecture of the complex is characterized by its combination of different styles, including Armenian, Georgian, and Byzantine.

Sanahin Monastery has played an important role in Armenian cultural and religious history. It was a center of learning and scholarship, with a renowned library and school of illuminators, and was a pilgrimage site for the faithful. The monastery was also the site of many significant events in Armenian history, including the coronation of several kings and the consecration of numerous bishops.

Today, Sanahin Monastery is a UNESCO World Heritage site and a popular tourist attraction in Armenia. Visitors can explore the complex's many architectural and artistic treasures, including its intricate stone carvings, frescoes, and illuminated manuscripts. The monastery's stunning natural setting, surrounded by lush forests and rolling hills, adds to its appeal as a destination for history and nature lovers alike.