20 Failed Mega-Projects That Were Supposed to Change the World

The Concorde added a touch of elegance to supersonic travel, but elegance was never the issue. The aircraft was expensive to operate, its ability to fly at full speed was limited, and it ultimately proved too costly for the mass market it was supposed to revolutionize.

The X-33 was intended to pave the way for less expensive, reusable spaceflight. However, technical problems with its liquid hydrogen tank led to the program’s cancellation in 2001, before it could even conduct the kind of test flight that might have justified this ambitious project. 

Texas was once the birthplace of what was to become the world’s most powerful particle accelerator. After spending billions of dollars and digging kilometers of tunnels, Congress canceled the project in 1993, leaving American physicists with a hole in the ground that cost a fortune. 

Denver wanted a baggage handling system that would give the airport’s logistics a futuristic feel. The result was a notorious technical disaster that contributed to delays in the airport’s opening and has become a classic example of the consequences of over-automation carried out too hastily. 

The Berlin-Brandenburg Airport was supposed to be a new, modern gateway to the reunified capital. Instead, it became a national laughingstock after years of delays, technical problems, and cost overruns, before finally opening its doors in 2020. 

Mirabel had been designed as the airport of the future, with the potential to expand into a massive complex. Its distance from Montreal, inadequate transportation links, and low passenger demand turned that promising future into a slow decline, and the passenger terminal was eventually demolished. 

The Ciudad Real Airport was supposed to relieve pressure on Madrid and become a major hub in central Spain. It opened at an unfavorable economic time, attracted little traffic, and became one of the most embarrassing examples of a ghost airport in Europe. 

The “Big Dig” has indeed transformed Boston; to call it a total failure would therefore be to overlook part of the reality. That said, this project has become the very symbol of the difficulties associated with megaprojects, due to massive budget overruns, lengthy delays, leaks, legal battles, and a fatal ceiling collapse. 

The California high-speed rail project isn’t dead, but the initial promise has not held up well. Voters were sold on the idea of a cleaner and faster connection between major cities, yet the current reality is marked by a much slower rollout, rising costs, and an initial operational segment that falls far short of the original vision. 

The “The Line” project was presented as a revolutionary desert city designed to completely rethink urban life. Its ambitions for 2030 have since been scaled back considerably, making the initial vision seem less like a concrete plan and more like a mere sketch that has found its way into public policy.

Masdar City was intended to become the world’s first planned zero-carbon city. The project is still underway and has led to valuable initiatives in sustainable development, but the initial “zero-carbon, zero-waste” vision has been scaled back, as reality has proven less cooperative than the master plan. 

King Abdullah Economic City was designed to become a major new business and logistics hub in Saudi Arabia. Years later, it is struggling to live up to the enormous expectations placed upon it, particularly the expectation that it would transform a wasteland into a thriving city almost at the snap of a finger. 

Buran was the Soviet response to the space shuttle—and, from a technical standpoint, an impressive one. It completed an unmanned flight, landed automatically, and then disappeared amid the financial and political turmoil that brought the program to an end. 

Iridium’s satellite phone network was a technological feat that ended in commercial disaster. Launched with great ambition, the system failed to keep pace with a rapidly evolving market, and the company filed for bankruptcy in 1999. 

Loon attempted to provide Internet access in remote areas using balloons floating in the stratosphere. This technology achieved remarkable feats, but Alphabet shut down the project after determining that the path to a viable business model was longer and riskier than expected.

Aquila was Facebook’s solar-powered drone project designed to provide Internet access to underserved regions. It was an ambitious project driven by a vision of global connectivity, but Facebook stopped developing the device and turned to partnerships instead.

The Strategic Defense Initiative promised a space-age shield against nuclear missiles. It revolutionized defense policy and the debate on arms control, but the original “Star Wars” vision never became the defense system that Reagan had described on television. 

The Clinch River project was intended to help pave the way for nuclear energy in the United States. But rising costs, political opposition, and doubts about the profitability of fast-breeder reactors ultimately led to its downfall, and the project was abandoned before it could become the energy breakthrough its supporters had envisioned. 

The SNR-300 fast-neutron reactor in Kalkar was completed but never went into operation. Safety concerns and political opposition helped transform this nuclear power plant project into something far more unusual: a site that was later converted into an amusement park. 

Monju was intended to be a crucial step in Japan’s nuclear strategy focused on fast-neutron reactors. A sodium leak, lengthy shutdowns, and repeated setbacks prevented it from realizing most of the future prospects for which it had been designed, and Japan decided to decommission it.