Why Does Pisa's Tower Lean? (And How to Fix It) | NOW I KNOW

The Leaning Tower of Pisa was built on a marsh in the Middle Ages, and should have collapsed centuries ago. What gives? Subscribe to the NOW I KNOW daily newsletter: http://nowiknow.com Subscribe on YouTube: http://bit.ly/2Ou50ix Facebook:   / learnsomethingnew   Follow Now I Know:   / nowiknow   Follow Dan Lewis:   / dandotlewis   Follow Matt Silverman:   / matt_silverman   NOW I KNOW is created, researched, and written by: Dan Lewis Hosted, edited, and directed by: Matt Silverman Motion graphics and animation by: Tori Finlayson Script by: Max Knoblauch Graphics help by: Bob Al-Greene