The clock is ticking for some of the world’s greatest wonders.

The world is full of breathtaking places that feel timeless and eternal, but a fragile combination of climate change, environmental degradation, and human pressure is putting many of them at imminent risk. A new and somber form of tourism, often called “last-chance travel,” is on the rise as people rush to see these endangered wonders before they are altered forever or disappear completely.
These are the destinations where the window of opportunity to see them in their current, magnificent state is rapidly closing.