From the record
“Land's End Observatory is a ranger observatory on the rim of Grand Mesa in Colorado. It is accessible from the Grand Mesa Scenic and Historic Byway via Land's End Road, which is about half paved and half gravel.”
Wikipedia article Land's End Observatory, CC BY-SA 4.0.
One of 33 National Register listings published here for Mesa County · listed in 1997 · category: Building.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service · the Wikipedia article