The Pan-American Highway began a century ago with a vision of unfettered motor-vehicle access between Alaska and Tierra del Fuego. What happened to the dream?

The decision to build a Panama Canal came about because of two lobbyists, one of whom thought a stamp would make a telling point.

As climate change looms, scientists seek ways to reduce the release of carbon. Sometimes a low-tech approach is overlooked: conserving forests.

This Central American country was a haven for visitors long before it became a major tourist destination.