The idea of an interoceanic waterway through Nicaragua is far older than the existing, 100-year-old Panama Canal.

More than 2,000 years of planning for a fixed link between Italy and the island of Sicily came tantalizingly close to fruition in 2006 when a construction contract was signed.

Engineers with the U.S. National Aeronautics and Space Administration are on track to support surface construction on the moon within a decade, says Robert P. Mueller, senior technologist in the advanced projects development in the surface systems office for engineering and technology at NASA’s Kennedy Space Center.

The Very Large Structure (VLS) is described as a 600-ft-tall "city on wheels" that would remain in almost constant motion as it rolled over the countryside.

Elon Musk, president Tesla Motors and SpaceX, dubs his brainchild, Hyperloop, a “fifth mode of transportation.”