How cool is this great photo of Portland? It shows a clear-cut hill in front of the Lewis & Clark Exposition of 1905. It marked the centennial of the Lewis and Clark Expedition. It ran for four months, attracting 1.6 million people. And, in the following years, the population of Portland exploded from 161,000 to 270,000 by 1910.

Source: Oregon Public Broadcasting & Oregon Historical Society
You’ll also like this beautiful image of Portland from 1927. It’s one of our most popular photos.