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When Notre Dame Cathedral caught fire in 2019, Paris came perilously close to losing more than 800 years of history. As engineers rebuild, researchers use cutting-edge technology to piece together what happened and restore the cathedral.

Scientists and engineers fight to save Notre Dame Cathedral after the 2019 fire.

Saving Notre Dame

After the Notre Dame fire of 2019, a team of architects and engineers must design a way to stabilize the famous cathedral's buttresses before its roof and entire structure collapses.

If the vaulting collapses, the weight of the buttresses will push in the 100-foot walls.

Stabilizing Notre Dame's Famous Buttresses

Saving Notre Dame Preview

By exploring Paris' underground tunnels, can scientists identify the original source of Notre Dame's vaulting stone, damaged in the 2019 fire?

Hidden under Paris is a rich source of limestone, a vast labyrinth of quarry tunnels.

Repairing Notre Dame's Vaults with Underground Quarries

Discover the effects the fire had on Notre Dame's stained glass, and how one scientist is meticulously cleaning and repairing it.

Could the cathedral's beautiful stained glass collection survive the 2019 fire intact?

Saving Notre Dame's Stained Glass Masterpieces

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When the roof of Notre Dame Cathedral erupted in flames in April of 2019, firefighters battled for nine grueling hours to save the historic landmark. Still, Paris came alarmingly close to losing more than 800 years of history. Now engineers are in a different race against time: to rebuild the roof and secure the medieval structure of Notre Dame. Underneath the charred scaffolding and vaulted ceilings of the cathedral, scientists study the components of Notre Dame’s iconic structure to puzzle out how best to repair it. (Premiered November 25, 2020)

Scientists and engineers fight to save Notre Dame Cathedral after the 2019 fire.

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NOVA investigates the story of cannabis from the criminalization that has disproportionately harmed communities of color to the latest medical understanding of the plant. What risks does cannabis pose to the developing brain? How much do we know about its potential medical benefits? As cannabis becomes socially accepted, scientists are exploring its long-term health consequences. (Premiered September 29, 2021)Check out a previously recorded panel discussion and audience Q&amp;A featuring experts and producers from "The Cannabis Question" <a href="https://youtu.be/nSTT5RZ_hxA">here</a>.

As state-legalized cannabis spreads, NOVA explores its little-known risks and benefits.

The Cannabis Question

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With the upcoming launch of the James Webb Space Telescope, the Hubble era is gradually drawing to a close. Here are some highlights from the countless wonders Hubble has shown us during its 31 years in space.

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A statue of Zheng He at the Sam Poo Kong Temple in Java, Indonesia. Image Credit: Budianto Santosa, Shutterstock

In the 1400s, Zheng He sailed thousands of miles around Asia and Africa in ships the size of soccer fields, spreading Chinese innovations like compasses and gunpowder in the process.

Saving Notre Dame

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Saving Notre Dame

Great Cathedral Mystery

Building the Great Cathedrals

Saving Notre Dame's Stained Glass Masterpieces

Operation Bridge Rescue

Stabilizing Notre Dame's Famous Buttresses

Repairing Notre Dame's Vaults with Underground Quarries

3D models help preserve landmarks like Notre Dame

Moving a Wooden Covered Bridge

Operation Lighthouse Rescue

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Explore More

Saving Notre Dame

Great Cathedral Mystery

Building the Great Cathedrals

Saving Notre Dame's Stained Glass Masterpieces

Operation Bridge Rescue

Stabilizing Notre Dame's Famous Buttresses

Repairing Notre Dame's Vaults with Underground Quarries

3D models help preserve landmarks like Notre Dame

Moving a Wooden Covered Bridge

Operation Lighthouse Rescue