Mt. Olympus is the most famous mountain in Greece, the mythical home of the ancient Greek Gods. From its steep rocky summit, first climbed only 100 years ago, Zeus supposedly hurled his thunderbolts against humankind. Its eastern flanks were the country's first national park (created in the 1930's), with dozens of endemic species of flowers, as well as some endangered bird and butterfly species; there are no roads within it apart from the trailhead access road.