Heiðmörk is a cool conservation area just outside Reykjavík that's perfect for outdoor adventures. Established in 1950, it's grown into a lush woodland with over four million trees and plenty of wildflowers. You can spot Arctic Foxes if you're lucky and check out the red hills, Rauðhólar, which are 5,200 years old. It's a popular spot for locals and visitors alike, so grab your hiking boots and explore this hidden gem!