On Belmont Hill, just 6 miles northwest of downtown Boston, lies Habitat, an 93-acre urban oasis that has been devoted to environmental education since 1970. Over 2.5 miles of gentle trails wind through deciduous and evergreen forests, across meadows, around two ponds, and along a wetland containing a vernal pool. The visitor center is a brick Georgian-style mansion where monthly art exhibits can be viewed. Outside, there’s a pleasing and calming formal garden. The building and gardens can be reserved on weekends for weddings and other events.