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

Alcatraz Island ... and the Army constructed a fort there, where it imprisoned Confederate soldiers during the Civil War. It continued to serve as a military prison until 1933, when the Justice ...

Spending decades as America's most formidable prison – and now serving as a mysterious tourist attraction – Alcatraz has captured ... from its origins as a military fort, through its time ...