How do you dismantle, transport, rebuild, and conserve a structure that is almost 1,000 years old?

This 28-minute documentary chronicles the dismantling of the 12th-century apse from the church of San Martín in Fuentidueña, Spain, and its reconstruction at The Cloisters, The Metropolitan Museum of Art’s Medieval branch, between 1958 and 1961. The film combines archival footage of the apse shot in situ,

It has become a location for spectacular a capella concerts thanks to its acoustics, and now includes modern art installations. Here’s a video of the installation of Janet Cardiff’s The Forty Part Motet.