Or
Enter your email address and we'll send you a link to reset your password.
To view this video please enable JavaScript, and consider upgrading to the latest web browser
A terrifying sea fortress, a highway in the Amazon that suddenly vanishes, a mysterious structure in the shadow of the Statue of Liberty are deserted engineering projects, and new discoveries reveal how they were built and why they were abandoned.
Our movie and video library can only be streamed or downloaded by members only