Saudi Arabia's $500 billion megacity is in jeopardy after a Saudi journalist’s death. Here's the status of the kingdom's other multi-billion-dollar infrastructure projects.

Saudi Arabia is undergoing a massive construction boom. A November report found that the nation had about 4,700 active construction projects, worth a total of $852 billion.

But the future of some of these projects is less certain following the brutal murder of journalist Jamal Khashoggi, which prompted many investors to rethink their contributions.

In late October, prominent figures like Y Combinator's Sam Altman and former US energy secretary Ernest Moniz temporarily pulled out of the plan for a $500 billion megacity.

While the development is still moving forward, others could also be in peril. Billionaire Richard Branson recently severed ties with two tourism projects in the area due to similar concerns. In a statement, Branson said the Khashoggi murder could "change the ability of any of us in the West to do business with the Saudi government."

A lack of international support could hinder Crown Prince Mohammed bin Salman's Vision 2030 plan, which aims to diversify Saudi Arabia's oil-driven economy. 

Here are some of the most expensive projects slated to go up in Saudi Arabia.

Neom: $500 billion

Neom's future is on thin ice in the wake of Khashoggi's death, which prompted at least five board members to suspend their involvement with the project.

If brought to life, the megacity would introduce a utopian vision to Saudi Arabia, complete with robot workers, drone taxis, and a bridge that connects to Africa.

Read more: Saudi Arabia wants to build a $500 billion megacity that's 33 times as large as New York City

Great Mosque of Mecca: $26.6 billion

Though it goes by many names — "the forbidden mosque,""the holy mosque,""the sacred mosque"— the Great Mosque of Mecca is known universally as the largest mosque in the world. 

With a history dating back to BCE, the structure has undergone numerous renovations, the latest of which was commissioned in 2007 by King Abdullahwik. Construction halted in 2015 when a crane collapsed into the mosque, killing more than 100 people.

With renovations back on, the mosque will soon be expanded to accommodate more than 2.5 million worshippers.

Al Faisaliah Smart City: $25 billion

Saudi Arabia intends to build a high-tech city along the Red Sea coast that relies on renewable energy sources. At an estimated $25 billion, the project will create nearly 1 million housing units for around 6.5 million people by 2050. It also aims to provide 1 million jobs in fields like technology, health, and education.