Altadena
Christmas Tree Lane is a 0.7-mile (1.1 km) stretch of Santa Rosa Avenue from Woodbury Road to Mariposa Street. It has been a holiday attraction since 1920, and it is the oldest large-scale outdoor Christmas lighting venue in the world. Each December, members of the Christmas Tree Lane Association festoon the 110 still standing giant deodars that line the street with thousands of Christmas lights. Christmas Tree Lane was placed on the National Register of Historic Places in 1990, and is a California Historical Landmark.
The Cobb Estate at the top of Lake Avenue is now a free botanical garden, operated by the United States Forest Service. It is guarded by its historic gates, which are easily bypassed to allow visitors and hikers to ascend its long and winding paved driveway to the site of what was once one of Altadena's premier mansions. This site is also found alongside the Sam Merrill Trail, which accesses Las Flores Canyon on the way to Echo Mountain.
Farnsworth Park located on Lake Avenue is a large county park that offers picnic grounds, play areas, and a club house and amphitheater. It was placed on the National Register of Historic Places in 1997.