The Liberty Bell Digital Twin Project recently created the first free, high-resolution public digital twin of one of America’s most iconic historical artifacts.
Researchers from the VAR Lab at Penn State Behrend recently completed a non-invasive field deployment to create the first free, high-resolution public digital twin of the Liberty Bell. Operating inside the Liberty Bell Center at Independence National Historical Park in Philadelphia, the team utilized restricted before- and after-hours windows between May 25 and May 27, 2026, to document the artifact.
Because the iconic symbol could not be touched, moved, or altered, the team engineered a multi-modal capture strategy to digitize the object safely. The project directly addresses data access; while a high-resolution scan of the bell exists, it remains privately held and restricted from public view. The team timed the deployment to align with the upcoming United States semiquincentennial (America250) celebration, with plans to release the finalized open-access assets online for educators, researchers, and the public.
A Multi-Sensor Workflow for Heritage Preservation
To thoroughly capture both the microscopic details of the bell and its surrounding museum environment, the VAR Lab engineered a highly sophisticated, multi-tiered sensor stack built for redundancy and precision.
For primary, ultra-high-definition geometry, the team deployed a FARO Quantum X FaroArm, capable of capturing surface variations down to 10 to 25 microns, a fraction of the width of a human hair. This was complemented by structured-light scanners, which projected specialized light patterns to quickly capture complex object geometry and fine visual details at up to 50-micron accuracy.
To transition from the artifact to the room itself, the researchers utilized a Matterport Pro3 LiDAR scanner to map out a room-scale, 360-degree virtual tour of the Liberty Bell Center. Finally, this structural data was paired with high-fidelity visual sensors, including a 45-megapixel Canon EOS R5 Mark II for photogrammetry and color texturing, alongside a suite of omnidirectional cameras, the Kandao QooCam 3 Ultra, Insta360 Pro 2, and Insta360 X5, to record stereoscopic VR180 and 3D/360-degree video for public-facing educational media.
Why the Liberty Bell Digital Twin Matters
This open-access initiative is highly significant because it allows access to a foundational piece of American history. The Liberty Bell famously cracked in 1846 and has not been fully rung since; because it is structurally fragile, visitors to the museum are restricted by crowd-control barriers and glass enclosures that prevent close inspection.
By combining laser-line scanning with accuracy down to 10 microns, structured-light scanning, and high-resolution photogrammetry, the VAR Lab captured structural details, historic inscriptions, and microscopic crack morphology at an unprecedented level of precision.
This digital twin functions as both an archival snapshot for long-term heritage preservation and an educational resource, allowing people globally to interact with the geometry of the artifact in ways that are impossible during a standard museum visit.
Lessons for Future Digital Heritage Projects
The success of this deployment demonstrates the growing importance of hybrid data workflows in the heritage preservation industry. Rather than relying on a single capture tool, the project successfully blended micron-level laser scanning with room-scale lidar and 360-degree virtual tour environments, creating a comprehensive spatial package. This multi-tiered approach provides a blueprint for future preservation projects, proving that complex, highly protected historical artifacts can be digitized rapidly without physical contact.
By publishing these assets freely on platforms like Sketchfab, the project challenges the commercial hoarding of cultural data and establishes a precedent for public-domain digital twins. As reality-capture technologies become more lightweight and accurate, the widespread adoption of these open-source preservation methods will likely accelerate, transforming how museums distribute historical data and how the public interacts with global heritage.
Project Resources
The primary data landing page for the final historic asset can be monitored at the Philadelphia Liberty Bell Digital Heritage Model on Sketchfab.
