Massive glaciers, staggering mountains, plains dotted with wild animals: We sure live in a big, beautiful world. And while pinpointing all of Mother Nature's greatest hits could take a lifetime, we think these 50 out-of-this-world landscapes and awe-inspiring wonders—from Arizona to Antarctica—need to move to the very top of your travel list.

This piece was originally published in 2015 and has been updated.