Paris

On April 15th, 2019, the most famous cathedral, the Notre-Dame, burst into flames. The fire lasted for 15 hours.

An excerpt from the article 23 facts about Paris
2/3 of the roof surface was destroyed, and a spire pierced the ceiling, collapsing into the building on the marble floor. Fortunately, most of the works of art and relics were not endangered, and only some of the sculptures and paintings were soiled with smoke.

The cathedral is to be rebuilt by 2024. However, full restoration may take over 20 years.