An oak tree seedling (© plusphoto/Getty Images)

【April 28 2017】Happy Arbor Day! The first observance of this holiday in the US was in Nebraska, on April 10, 1872, when participants planted one million trees. It’s now celebrated nationwide, and has been adopted by countries around the globe, which mark it at different times of the year depending on local tree-planting seasons. Maybe you can celebrate by nursing a tiny sprout from an acorn, like the one in this image, into a mighty oak.Explore breathtaking Gallery from the HuluTrip homepage over the past 5 years..