Subways: HUH! What are they good for?

In this episode of Stuff You Should Know, Josh and Chuck dive deep underground to explore the fascinating world of subway systems. They cover everything from the engineering marvels of tunnel construction to the daily operations that keep millions of people moving beneath major cities like New York, London, and Paris. The hosts discuss the incredible challenges builders faced in the 1800s and early 1900s when creating these underground networks, from dealing with horse manure-filled streets above to navigating rivers, bedrock, and mysterious unmarked pipes below.