6.2 kilometers (out‑and‑back)
Buhammeren is the remnants of an earlier volcano. At Hadeland there are three of these, Brandbukampen and Sølvberget are the other two. Phenomena like these are rare. On the ascent to Buhammeren lies an open marble quarry. There are several viewpoints along the way to the top.
Start: Vienlinn by the boom / information board about Buhammeren.