The Redwood Grove comprises old-growth "virgin" redwoods, the oldest trees of which are approximately 1,400–1,800 years old and grow to approximately tall and over in diameter. Referred to by locals as "the loop," the grove is primarily a self-guided walk—but on most summer weekends, and many other times year-round, free guided walks led by docents or park employees are available. Featured on the loop are unique old-growth redwoods, including one with albino growth lignotubers and the John C. Fremont tree (a tree hollowed out by fire that was once used as a resort honeymoon room).