Humans have long been obsessed with building big, and as the world strives to combat climate change, megastructures may hold the key to a more sustainable future.

Earth is covered with technofossils, or man-made materials, that will last for centuries and maybe even longer.

Each year, National Geographic highlights a collection of the most compelling images captured by Nat Geo photographers over the past 12 months in their "Pictures of the Year." For 2025, Nat Geo ...