The fire that ravaged Notre-Dame cathedral in Paris on Monday left a scarred skyline that one of the French capital’s most iconic structures has graced for centuries. Gone is the cathedral’s soaring, delicate 300-foot spire, which collapsed in the flames. The cathedral’s wooden roof is now blackened and charred.

In the aftermath of the fire, a reckoning has begun into the cause of the blaze and how it could have spread so quickly through the historic building.

Here is a guide to some of our coverage of the devastating blaze.

Planners Underestimated the Risk