A fire has devastated the 850-year-old cathedral in Paris. What will it take to rebuild the iconic structure? Chicago Tribune architecture critic Blair Kamin joins us in discussion.

The world reacted with shock, horror and prayers to the massive fire Monday at the Notre Dame Cathedral in Paris, united in grief and in solidarity with the people of France.

A massive fire engulfed the roof of Notre Dame Cathedral in the heart of the French capital Monday, shooting up its long spire and sending thick plumes of smoke high into the blue sky as tourists and Parisians looked on aghast from the streets below.