They were once some of the most advanced structures and facilities on the planet, standing at the cutting-edge of design and construction. Today they are abandoned, dangerous, some of them even deadly. From uninhabited cities to empty factories, these long-forgotten engineering marvels are scattered around the globe. Science Channel uncovers why some of the world's most advanced architectural achievements were eventually left behind in the all-new series Mysteries of the Abandoned.
May 2017 - September 2019
April 2017 - May 2017
March 2018 - May 2018
October 2018 - December 2018
April 2019 - May 2019
October 2019 - November 2019
March 2020 - June 2020
December 2020 - February 2021
April 2017 - April 2018