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Podcast Episode 123: Washington D.C.'s Hidden Tunnels
 
In 1924 a curious network of catacombs was discovered in Washington D.C. They were traced to Harrison Dyar, a Smithsonian entomologist who had been industriously digging tunnels in the city for almost two decades. In this week's episode of the Futility Closet podcast we'll describe Dyar's strange hobby -- and the equally bizarre affairs in his personal life.

We'll also revisit balloons in World War II and puzzle over a thief's change of heart.