The Medford Historical Society & Museum welcomes author and journalist Alison O’Leary for the talk “Hikes Through History,” part of a weekend program being co-presented with the Friends of the Middlesex Fells. O’Leary, author of the Appalachian Mountain Club guidebook “Best Day Hikes in Boston,” will share some of her favorite hikes using maps and historic photos. Hiking, she highlights, “is more than a stroll through the woods when you know how the land was used in the past. In Massachusetts, many parks and trails have been carved out of historic sites, whether ancient Native villages, industrial sites, or grand estates.”

Admission is free, but attendees are asked to please RSVP through the Friends of the Fells website.

On Saturday at 10 a.m., the weekend program continues with a guided walk in Stoneham to Pickerel Rock, led by Middlesex Fells authors and historians Doug Heath and Alison Simcox.