MOUNT OLYMPUS Olympic National Park. Olympic National Park perhaps offers the greatest contrast in natural features of any of our parks. Mount Olympus alone holds 6 major glaciers and some smaller ones. Altogether there are more than 50 glaciers in the Olympic Mountains. Yet the park's rain forests are of almost tropical luxuriance because of the excessive rainfall, calculated to be more than 140 inches in some years on Olympus and some neighboring high country. The largest known Sitka spruce, Western Hemlock, Douglas fir, and Western redcedar are found in the park; and heavy moss drapes tree trunks and fallen trees and hangs curtain-like from high branches.