You would expect to see Ginkgo trees in a warmer and more temperate place. But by Vantage, Wash., on the west side of the I-90 bridge, there is a forest of petrified ginkgo trees. You can wander dirt trails on a hillside to see all the half-buried ginkgo trees. It is easier to just stop at the store outside the park for the best specimens. If you park at the museum, you will need a pass, and it costs $30 for the annual pass (for all Washington day-use parks) or, I think, $10 for the day. So if you are on a tight budget, go to the store near the entrance to the park, and then drive farther up the main road to gain access to the dirt trails. The museum has some exhibits that explain how a ginkgo trees ended up here, in what had been a swamp sometime in the past. I would also recommend that you go to Wanapum Dam, down the river some 10 miles south. Watch the film about the Great Missoula Floods. The film will explain the sights you will see if you travel north toward Wenatchee and Banks Lake toward Grand Coulee Dam. It will explain how all the coulees were formed, and why there are huge granite boulders out in the middle of farm fields, during the repeated floods. Wanapum Dam is also free, and so you can see most of this without paying the $30 annual fee.