The cache is not at the posted coordinates, however there is a benchmark - AA2673 which can be found nearby.
Benchmarks can range from a brass disk, to a fire hydrant, to bolts in bedrock, to church steeples, courthouse cupolas, radio towers, and water tanks. The most common benchmarks are the geodetic survey marks – cast metal disks with stamped legends on their face and can be found in such places as rock ledges, concrete mounds in the ground, or affixed to outside building walls.
Each geocaching page has a link (all nearby benchmarks) to the Geocaching Benchmark database imported from the National Geodetic Survey (NGS). Benchmarks are identified by an NGS Permanent Identifier (PID) in the format of two letters and four numerals (AA1111). Searching and documenting benchmarks allows others to share photos of the various areas where they are found.
The Adventure Lab will take you to some of the different types of benchmarks in the Falls Church area.
You can learn the final coordinates for this mystery cache by completing the "Benchmarks in the Falls Church Area" Adventure Labs.
You will need a smartphone with data service and the Adventure Lab app installed.
You can install the app by going to Adventure Labs.
You can launch the adventure by opening the Adventure Lab app and browsing to "Benchmarks in the Falls Church Area".
The locations can be done in any order and there are coordinates on each location page to help in planning, each Journal entry will contain a two digit code. They can be reviewed at any time once that stage has been completed or after all stages have been completed especially your last stage.
These five two digit codes need to be put into numerical sequence to form a ten digit string that will be entered into Certitude as a keyword to receive the actual final coordinates for this cache along with bonus information.
You can validate your puzzle solution with certitude.