3. It Was Once the Most Expensive Skyscraper In the World

Due to its use of pricey, quality materials for both its interior and exterior, like bronze, travertine and marble, the Seagram Building’s construction cost a whooping $36 million dollars (in mid-century dollars). Though the $3.9 billion in costs for the construction of the One World Trade Center  in 2014 make it the world’s most expensive skyscraper, $36 million would be at $297.6 million today.