Scientist Pete Kelsey and his team have 3D-mapped the entire island of Alcatraz, discovering Civil War secrets, prisoner escape routes – and looking at ways to preserve the island for the future.

Alcatraz is not connected to mainland electrical or water grids. Instead, the island relies on nearly a thousand solar panels ...

as Kelsey made his first trip to Alcatraz, he already viewed the project as a once-in-a-lifetime endeavor. There are many spaces on the island that visitors don’t get to see, and before ...