After leaving Portland yesterday afternoon and cruising north, downstream, on the Willamette River, National Geographic Quest entered the great Columbia River and turned west toward the river’s mouth and the lovely little town of Astoria. Our day was filled with explorations of the history of the region, beginning with a visit to the excellent Columbia River Maritime Museum. The rest of the day took us to two historic forts on the south side of the estuary: Fort Clatsop, where Lewis and Clark’s Corps of Discovery spent the winter, and Fort Stevens, which is a military battery that defended the entrance to the river in the early 20th Century.