I visited Fort Clatsop yesterday. Lewis and Clark and their Corps of Expedition spent the winter of 1805-1806 here. It represented the westernmost terminus of their historic journey to explore the Louisiana Purchase and to find a route to the Pacific Ocean. The fort that stands today is a replica, of course; the original is lost to history (but built anew through the drawings and notations found in Lewis's journal).
I have been fascinated with the story for the Corps of Discovery for a long time. It was truly neat to stand on the ground upon which they stood, and worked, and lived two centuries ago. Here are some pictures.