Portland Oregon

The Oregon Museum of Science and Industry is a fabulous attraction & educational resource for all of us.
5 exhibit halls & 8 science labs offer hundreds of interactive exhibits and hands-on demonstrations.
OMSI's multi-attraction complex features a big screen Theater, the Northwest's largest planetarium, and the USS Blueback, the last fast-attack, diesel-powered submarine built by the U.S. Navy.

OMSI has intermittent days or operation that can be checked here.