The Most Expensive Construction Projects Known to Mankind

9.Gulf Railway

Where: Persian Gulf Completed Cost: $250 billion * Year: 2023 The governments of the six Gulf Cooperation Council (GCC) countries will receive a proportionate share of the $250 billion enormous bill for the Gulf Railway, depending on how much of the network will be in each nation. Once the project is completed, high-speed rail capable of reaching speeds of up to 136 mph would link all six Gulf nations.

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Railroad Gulf ©Shutterstock/Kateryna Galkina The first line is expected to be finished and operating by 2023; however, the completion of the entire rail system is not anticipated to be completed before 2030 due to delays in the Bahrain-Saudi line construction that are expected to last until at least 2023 and Oman's decision to pause their portion of the project.

10. High-Speed Rail in California

Where: USA, California All in all: ~$100 billion* Completed Year: Mid-2030s Although work on the California High-Speed Rail may have started in 2015, Assembly Bill 3034's approval by the state assembly and Governor Schwarzenegger's signature in 2008 marked the beginning of the project's seven-year journey. The California High-Speed Rail Authority awarded the contract to the engineering firm WSP USA, and the railway's plans got under way.

Pinterest, Guillermo Alvarez Calderon, and California High-Speed Rail Construction problems have caused a delay in the Initial Operating Segment's scheduled opening, which was supposed to transport passengers around the bay area. Phase 1 of the High-Speed Rail is expected to be finished by the early to mid-2030s and will take travelers two hours and forty minutes to travel the three hundred and eighty miles from Union Station in Los Angeles to San Francisco.