The Harmon Tunnel located in Winterset, Iowa, USA, is an engaging piece of history that brings the towns industrial heritage to life. Constructed due to the Harmon Mills strategic location near Mad Creek, the tunnel served as a crucial transportation link for horse-drawn carriages and wagons carrying goods and people between the town and its surroundings. Although the Harmon Mill was abandoned in 1904 and removed before the tunnels first expansion in 1925, the tunnel itself continues to stand as a remarkable testament to Wintersets resilient past. As you walk through the tunnel, immerse yourself in the lives of those who traveled this same path a century ago, and experience Wintersets rich history come alive before your eyes.