Buffalo, including calves, graze on the North Rim of the Grand Canyon.

Tom, a tree-hugger from way back, can't get his arms around the 16-foot circumference of the 300-to-500-year-old Ponderosa Pine on the Widforss Trail on the North Rim of the Grand Canyon.

A huge Ponderosa Pine on the Widforss Trail on the North Rim of the Grand Canyon.

One of the stunning views from the North Rim of the Grand Canyon.

Aspen along the U.S. Forest Service road where we camped and took our morning walks.

One of the stunning views from the North Rim of the Grand Canyon.

One of the stunning views from the North Rim of the Grand Canyon.

Our spot in the pines on a U.S. Forest Service Road on the North Rim of the Grand Canyon.

One of the stunning views from Point Imperial on the North Rim of the Grand Canyon.