An official website of the United States government
Here's how you know
Official websites use .gov A
.gov website belongs to an official government
organization in the United States.
Secure .gov websites use HTTPS A
lock (
) or https:// means you've safely connected to
the .gov website. Share sensitive information only on official,
secure websites.
Summit Lake National Natural Landmark in Clear County, Colorado
Photo by D.Miller
Each National Natural Landmarks adds to the story of our nation's natural history. Explore the stories of fossils, swamps, caves, craters, volcanoes, and more below.