Built by the glacier and blessed by indigenous tribes who hunted and worshiped here, the cave-like shelter and its surroundings are an intriguing blend of geologic and human history. Nature lovers can enjoy expanses of wildflowers, hardwood forests and pine groves, while watching for a wide variety of animals, from wild turkeys to painted turtles.

The centerpiece of the property, understandably, is the massive, 20- to 30-foot-high rock enclosure that stands guard over man-made Carter Pond. But visitors who choose to explore the 196-acre tract will find there’s plenty more to sample from this multi-faceted greenspace. Like much of central Massachusetts, the history of Rock House Reservation is that of forests transformed into farmlands, ponds and streams turned into mill power, and now all reverting to their natural states.

Trails: More than 3 miles of trails and woods roads. Moderate hiking, strenuous in places.