4. Alpine, New Jersey
Alpine is a quiet, tranquil town in New Jersey. It is a suburb of New York city and is said to be one of the richest town in US.
The average home price of this town is close to $6 million and the population is just 1849.
The town is famous for Mega Stone Mansion that has an area of 30,000 square feet that includes 42 rooms in total and has a price tag of $49 million. One would take an hour to tour the house.