Rock Circuit Loop

The trail often takes short detours to reach more boulders (they don't call it Rock Circuit for nothing) and also visits the ruins of the MIT Geodetic Observatory. The trail is reasonably well-blazed (in white) but it crosses many other trails and fire roads so a map or the Mobile App is strongly recommended.As shown, this lollipop hike starts from the Flynn Rink parking area and uses the Cross Fells Trail: Flynn Skating Rink To Black Rock to join with the Rock Circuit Trail.