The Neff House and the Betz Mystery Sphere: A Tale of Mystery and Abandonment in Florida
Step into the enigmatic world of the Neff House, an abandoned 1920s mansion nestled on Fort George Island in the Jacksonville, Florida area. Shrouded in mystery and history, this architectural gem invites urban explorers to uncover its secrets. Known for its striking design and intriguing backstory, the Neff House stands as a testament to a bygone era, captivating adventurers and history enthusiasts alike. Adding to the allure is its connection to the Betz Mystery Sphere, a curious artifact that has fueled speculation and wonder for decades.
Now, you can virtually explore the Neff House like never before. With 19 stunning panoramic images in the interactive tour below, immerse yourself in every detail of this historic property. Take a 360-degree journey inside and around the mansion, experiencing its grandeur and decay from the comfort of your screen. Whether you’re here for the history, the mystery, or the thrill of exploration, the Neff House promises a unique adventure that sparks the imagination.
Click here to view it in fullscreen.
Nestled on Fort George Island near the historic Kingsley Plantation, the Neff House stands as a poignant reminder of tragedy, mystery, and abandonment. This once-grand mansion in Jacksonville, Florida, now shrouded by dense woods, weaves together the eerie tales of two families—the Neffs and the Betzes—and a bizarre artifact that captured the nation’s imagination.
The Neff Family Tragedy
The Neff House was conceived as a winter retreat for the affluent Neff family. In 1927, Nettleton Neff commissioned Mellon Greeley, a renowned Jacksonville architect, to design the mansion. Greeley considered the Neff House his “most unique” creation, a testament to his architectural ingenuity.
However, tragedy struck the Neff family before the home could be completed. Nettleton’s wife, Katherine, perished in a mysterious fire that engulfed their summer home in Michigan. Just two years later, Nettleton’s son, William, died by apparent suicide, hanging himself from an apple tree. Grief consumed Nettleton, and three years after William’s death, he took his own life by shooting himself in the temple. These successive tragedies left the mansion abandoned in Jacksonville, an empty shell of what it was intended to be.
The Merrill and Betz Families
After years of neglect, the property was purchased by Kenneth Merrill, who briefly owned the house before selling it to the Betz family in 1967. The Betzes were the first to make the Neff House their full-time residence, bringing new life to the mansion—but only for a time.
In March 1974, while investigating a brush fire near their property, Antoine and Gerri Betz, along with their 21-year-old son Terry, discovered an unusual metallic object: a perfectly spherical, 22-pound steel ball with a triangular marking. What seemed like a simple curiosity soon became the center of a paranormal enigma.
The Betz Mystery Sphere
The sphere, dubbed the Betz Mystery Sphere, displayed inexplicable behavior. When placed on a table, it appeared to move on its own, rolling, stopping, and changing direction without any external force. As the family continued to observe the sphere, strange phenomena began to unfold in their home.
According to a 1975 article in The Jacksonville Journal by Sandy Strickland, the family reported hearing organ music in their seven-level, 21-room mansion, despite there being no organ in the house. They experienced mysterious phone calls, disembodied voices, banging doors, and glassware inexplicably shattering from closed cupboards. The sphere’s presence seemed to coincide with an escalation of these unexplainable events.
Scientific Examination of the Sphere
Eager for answers, the Betz family allowed Carl Wilson of the Omega Minus One Institute in Baton Rouge to study the sphere. Wilson discovered that it emitted a magnetic field and transmitted a radio signal. Another researcher, Dr. James Harder, concluded that the sphere’s shell was composed of an iron-chromium alloy and that its core might contain uranium, as revealed by x-rays.
Seeking further clarity, Mrs. Betz approached the U.S. Navy, which conducted its own tests. The Navy’s metallurgy analysis identified the sphere as stainless steel, suggesting it was man-made. Despite these findings, the object’s true origin and purpose remained a mystery. Shortly after these examinations, the sphere vanished, leaving behind only speculation and theories about its fate.
The Neff House Today
The Betz family vacated the Neff House in 1985. In 1989, the Florida Park Service acquired the property, intending to repurpose it as office space. However, the mansion now sits abandoned in Florida’s dense woods, a silent witness to its haunted past. Urban explorers who venture to the site are greeted by crumbling walls, overgrown vegetation, and an atmosphere heavy with the weight of its history.
A Legacy of Mystery
The Neff House and the Betz Mystery Sphere continue to fascinate history buffs, urban explorers, and paranormal enthusiasts alike. This abandoned mansion in Jacksonville serves as a chilling monument to the tragedies and enigmas that unfolded within its walls. As the house deteriorates, its story grows richer, waiting for the next curious adventurer to uncover its secrets.
For those intrigued by abandoned places in Florida, the Neff House stands as a testament to the unexpected tales hidden in forgotten corners of the state. Whether it’s the architectural marvel of Mellon Greeley, the tragic history of the Neff family, or the perplexing mystery of the Betz sphere, this site offers a captivating glimpse into a bygone era.
You might also find this virtual tour of the abandoned Apalachicola River Inn in Apalachicola, Florida. Down the street from the Neff House is the Kingsley Plantation that you might find fascinating as well or even the Huston House at Butler Plantation in Georgia. You can also check out our top abandoned places in Florida page.
Here is an 8K 360VR video around the abandoned Florida property
Virtually urban explore more residential locations.

A 360-degree spherical panoramic photograph captured at the abandoned Neff House in Jacksonville, Florida.
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Equipment used to capture the 360-degree panoramic images:
- Canon DSLR camera
- Canon 8-15mm fisheye
- Manfrotto tripod
- Custom rotating tripod head
Do you have 360-degree panoramic images captured in an abandoned location? Send your images to Abandonedin360@gmail.com. If you choose to go out and do some urban exploring in your town, here are some safety tips before you head out on your Urbex adventure. If you want to start shooting 360-degree panoramic images, you might want to look onto one-click 360-degree action cameras.
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