The eighth president of the U.S. -- admittedly, not one of the best-remembered presidents in American history -- Martin Van Buren (1782-1862) grew up in the Upper Hudson Valley in the town of Kinderhook (it's said that "okay" comes from his references to Old Kinderhook by its initials). Van Buren bought the estate in 1839 during his presidency as a place to retire. He named the 226-acre farm Lindenwald and built a Georgian-style mansion here, where he lived out the final 21 years of his life.