This is the Cape Meares lighthouse, on the mid-Oregon coast, located on the tip of Cape Meares just south of the Tillamook bay. An oil lamp originally provided the light, which was formed into a beam by a set of first-order glass Fresnel lenses. They were manufactured in France and shipped around the tip of South America to Oregon. Some of the lenses were filtered by red glass so that an alternating white-red pattern was produced, creating the unique signature of this lighthouse.
The Fresnel lens shape can be seen just to the left of the red filter, and in the lens sitting behind the filter. (Unfortunately, my camera can also be seen in the reflection. I was moving pretty fast, needing to take this picture between tour groups, and missed the reflection.)
Looking out through the glass windows gives a panoramic view of the Pacific Ocean. Even more key to this quarter's theme is the fact that glass was essential to the operation of this structure, and is a key part of its interest today.