Sept. 19 carries a unique significance in Mexico: on this very date — 32 years apart — two powerful earthquakes struck the country, killing thousands and toppling buildings. The 2017 magnitude 7.1 quake damaged more than 150 churches in Mexico City, 40 of them forced to close. While most religious sites have been restored, some remain shuttered. Each year, survivors, officials and religious leaders gather to remember the victims and refine strategies for a city that lives under constant seismic threat.