And the island has never been shy about squeezing in more wherever it can find the space. Even so, it’s hard to imagine anywhere the city can fit six sky scrapers, 100 shops, 20 restaurants, a school, and 14 acres of parks. How about on a platform over the country’s busiest commuter rail yard? Go ahead and add superlatives to the list of things New York can’t get enough of.

Hudson Yards is the largest private development project in U.S. history, and it’s being built without footings or foundations. Instead, the project is going to sit atop 300 concrete-sleeved, steel caissons jammed deep into the underlying bedrock. Work on the platform broke ground last week, and will take roughly two and a half years to complete. In that time, there’s a lot of engineering to do.