The Denver International Airport: The construction of the Denver International Airport in the 1990s was plagued by delays and cost overruns, ultimately costing $4.8 billion, more than $2 billion over budget. The mistakes made during the construction process included poor management, faulty planning, and design errors. The Boston "Big Dig": The Boston "Big Dig" was a massive highway construction project that was intended to improve traffic flow in the city. However, it ended up costing $22 billion, more than double the original estimate, due to poor management, delays, and cost overruns. The Freedom Tower: The construction of the Freedom Tower at the World Trade Center site in New York City was plagued by cost overruns and delays. The tower, which was originally estimated to cost $3 billion, ended up costing $3.9 billion, due to design changes, security requirements, and other unexpected expenses. The San Francisco Bay Bridge: The construction of the San Francisco Ba...