The reconstruction of the monument included building a new roof and spire on top of the building. The restoration also revealed murals covered by centuries of grime.

Five years after Paris watched Notre Dame Cathedral burn, the 861-year-old structure has been restored. It is slated to reopen its doors to the public on Sunday, December 8, with two Catholic masses will commemorating the event.

In a social media post, the United States Catholic Conference of Bishops wrote that as the cathedral reopens its doors, “local churches in the U.S. are invited to peal their bells in a gesture of unity.