Mount St. Helens is situated in the heart of Washington. It is an active volcano of great size and condition. Its last eruption was in 1980 and it drastically altered the landscape around the mountain. How to get there: By car, it is easy from both Portland OR Kelso. There is a fee to enter the park, which can be placed in the mailboxes that are near the car. It costs $10 if I remember correctly.