New York: America's Busiest City

Ade heads to Harlem and meets residents who are benefiting and suffering at the hands of gentrification. The price of a townhouse here has gone from $50,000 to over $4 million in 30 years. Ant is at Hudson Yards on the west side of Manhattan where an entirely new district is being built on top of a functioning rail depot. It's an innovative building solution to the island's lack of land.