The other volcano - much closer to Portland. It's possible to view both St.Helens and Mt.Hood from several locations on SR.35. Unfortunately, hit it rather late in the day and hence didn't get a chance to explore this beautiful area :(
SR.14 runs along the banks of River Columbia on the Washington state side.
'Bridge of the Gods' - across Columbia River, joining Oregon and Washington states. The bridge itself is nothing spectacular, but gets its name from an older natural stone bridge that used to exist there.