Abandoned Inventions hunts down history's most incredible innovations — abandoned, forgotten, or deliberately erased — and uncovers why they disappeared, and where they secretly resurfaced. A Canadian fighter jet ordered destroyed resurfaces in a game controller. A CIA mind-control program burned to ash gets its core question answered willingly by billions online. A Tesla tower dynamited on Long Island ends up charging your phone. Some ideas were too dangerous. Others too radical. All of them are still out there, hiding in plain sight.