North of Seattle and East on US Hwy 2 is the town of Index. As a child in the 1950s I lived there for 6 weeks. It was a Nickel mining town. In 1978 I drove thru it and it was all gone and brand new condos were all over the place. Research might uncover some old places like parks, schools, carnival/circu sites, etc.
US 2 east of Everett
Index (Snohomish). few interesting buildings exist, disappearing