Join Joe Rosenberg, a producer, as he reveals the astonishing tale of Britain's historical war bonds that take nearly a century to settle. Sean Real, a composer, dives into the riveting evolution of concert pitch and its international ramifications. Katie Mingle, a senior producer, shares the mystery of an abandoned Argentine diplomatic mansion in D.C. Finally, Delaney Hall takes us back to the Manhattan Project, highlighting a baby boom amidst top-secret projects. From finance to forgotten properties, these stories explore the quirky side of our built world.