From now till May 21, New Yorkers and lovers of NYC get to vote on their favorite landmarks–places like Brooklyn Public Library’s Central Library, Weeksville, the Guggenheim and the High Line–through an initiative called Partners in Preservation. Each time you vote (up to 1x per day!) you increase the odds that a place like Brown Memorial Baptist Church in Clinton Hill will get the grant money it needs to repair its Tiffany windows. Forty historic sites are competing for $3 million in funding, and to find out what makes them all so special, and deserving of that money, you can visit them during a special open house this weekend. Weeksville, for instance, is having a free, family-friendly day on Saturday from noon to 5pm (and after that they’re all biking to the Brooklyn Museum for this month’s Target First Saturdays, where DJ Spooky will be spinning). Greenpoint Manufacturing and Design Center is hosting open studios for its artisan tenants from 11-5 both days, and the Brooklyn Public Library is holding behind-the-scenes tours throughout both days. The full list of open house events is here. And you can vote for you favorite sites at partnersinpreservation.com.