Spire climbs 1 WTC, Park Slope’s most impressive listings … and more

1 WTC spire climbs the iconic ground zero tower. FIPS breaks down Park Slope's hottest listings. The world's best gingerbread structures include a brownstone, a trailer park, a tree house and a baseball stadium. Millennials want to buy their own homes one day, but will they be able to? New York to get a Museum of Mathematics, MoMath. Read these stories and more after the jump.