USGS has unveiled its most detailed national geologic map, giving the public a free, interactive way to explore underground ...

Do you ever find yourself wondering about the rocks beneath your feet? If so then the USGS has exactly the tool you're looking for, and it's free.

Going for a hike this fall? The U.S. Geological Survey has free maps that might come in handy. The public topoBuilder app is now offering custom maps made free with their 25K Recreational Topo layer.

Beginning in the 1940s, the U.S. Geological Survey’s National Mapping Program was tasked with the immense cartographical feat of surveying the entire country to create a series of more than 50,000 ...

Those giant maps gathering dust in the corner of your favorite outdoor store have finally been brought into the 21st century. National Geographic‘s new service, launched last week on their Maps site, ...