Why do train tracks in the UK measure exactly 4 feet, 8.5 inches apart? Why do cities like London and New York have such wildly different street layouts? Why are some airport terminals shaped like a long corridor, and others like a starfish? The answer, in many cases, isn’t about logic or innovation—it’s about path dependency.

This week on Built on Numbers Weekly: Qatar’s $22bn infrastructure plan, Spain revives plans for Europe-Africa tunnel, Vancouver seeks a partner for its C$3.5bn artificial island terminal, Bally resumed construction on its $1.7bn casino in Chicago & Kraft-Heinz has ambitions to upgrade its U.S. manufacturing plants!

This week on Built on Numbers Weekly: Queen Elizabeth II Memorial Designs Revealed, Singapore’s $3.4B T5 Mega Airport, Disney Announces First Middle East Theme Park, Trump Announces 80-Story Trump Tower in Dubai & Alabama's $3.5 Billion Bridge!