This not-for-profit, volunteer-run organization was founded in 1984 to preserve a national historic landmark and…More educate the public.</p> <p>Donations help maintain the property's three acres, conserve gravestones, provide for seasonal cleanups, stone wall repairs, tree work and go toward educational programs.</p> <p>The Reformed Church of Tarrytown is the modern-day extension of the Old Dutch Church of Sleepy Hollow.</p>