Explore cranes on the Wikipedia
Thomas referred me to the City of Iron in Germany
Cable cranes allow for flexible movement of loads across large areas, like rivers and gorges
Cable is cheap, and is sold at all local hardware stores. You, too, could have a cable crane in your back yard with a few dollars and a winch!
Often built into industrial buildings for moving loads on an x-y plane projected on a workshop floor
Handy for mounting on trucks