Scientist Pete Kelsey and his team have 3D-mapped the entire island of Alcatraz, discovering Civil War secrets, prisoner ...

When you hear the name Alcatraz, you probably think of Alcatraz Island up San Francisco way. Or if you know something about ...

Located on the east side of Alcatraz Island, the original 1857 sign on the sallyport was concealed by a century-old building that backed up onto it. Kelsey’s discoveries have also lifted the ...