See inside an underground complex of tombs in Egypt, some of which can only be accessed by crawling through narrow tunnels to reach the 2000-year-old sarcophagi within. Explore 'Egypt with the World's Greatest Explorer,' tonight at 10/9c. | National Geographic TV

In Minya, Egypt, the Church of the Martyrs of Faith and Homeland stands as a powerful witness to courage and faith. Built near Samalut, it enshrines the remains of 21 Coptic Christians beheaded by ISIS in Libya in 2015. These Egyptian migrant workers were martyred for their faith in Christ, their final prayers echoing across the world. After their bodies were recovered, the church was raised in their honor, housing their remains, orange jumpsuits, and personal effects—sacred reminders of their u