The Line is a 100 mile skyscraper city that Saudi Arabia has begun to build. It's likely to be either one of the greatest feats of modern-day engineering or a monumental, half-trillion-dollar failure.

The scale is quite large. According to CNBC, the Line is designed to house up to nine million people. The entire development will be powered by renewable energy.

Since then, a lot of experts and architects have criticized it. The project is shrouded in controversy with watchdogs already reporting human rights abuses during the first days of construction.

Desert Monument

The Neom development area will include a mountain travel destination called Trojena and a massive floating industrial complex called Oxagon.

If it will ever be completed, the scale is similar to Egypt's pyramids.

Antoni Vives, chief urban planning officer at Neom, told CNBC that Neom is not an easy project to deliver. It is exciting to see the vision come to life as we make strong progress.

Humanitarian Cost

The construction of Neom will most likely come at a humanitarian cost. According to CNN, the kingdom executed 81 men in March.

Human Rights Watch warns that migrant workers will be at the mercy of their employers and will operate outside of labor laws.

Executives from foreign architecture firms are being offered million dollar salaries to work on the project.

There's a chance Saudi Arabia's giga project won't end up being a monument to modern society because of what's at stake.

Saudi Arabia is pushing ahead with its sci-fi cityvision.

Saudi Arabia starts construction of 100 mile skyscraper.