Visit Great Hollow for our second annual “Hike the Hollow” event in celebration of National Trails Day®. Come take a naturalist-guided tour through Great Hollow Nature Preserve and the neighboring Michael Ciaiola Conservation Area. The hike might be challenging in spots and include uphill and downhill terrain, so please wear proper footwear, and bring a snack and plenty of water. We’ll meet at the Great Hollow parking area and then carpool to the Michael Ciaiola Conservation Area. Please register by emailing John at .