Book excerpt: Hudson Valley is steeped in mysteries, from Celtic chambers resting in the deep woods of Putnam to Millbrook's abandoned Bennett College. The beautiful, tree-spotted landscape of the Hudson Valley hides the strange and sometimes frightening stories of the region. In the Highlands, Iroquois chief Daniel Nimham gave his life for the cause of American independence. The great passenger steamship Swallow sank near the shores of Athens. And there is even one strange night in the Catskills where a legendary playwright miraculously survived a midnight plunge off the suspended Schoharie Bridge. Author Allison Guertin Marchese reveals a treasure-trove of curious tales recounting the most uncommon history of bad guys, bold girls, creepy colleges, missing mastodons and more in this wondrous region of New York.