The city's Historic House Trust is opening the doors of some of the oldest homes in the city this weekend, as part of a celebration marking the 400th anniversary of Henry Hudson's voyage up the Hudson River.

The trust is also celebrating its 20th anniversary.

The Wyckoff Farmhouse Museum in Midwood, Brooklyn, seen above, which was built in 1652 and is the oldest house in the state, is just one of the 20 historic houses in the five boroughs that visitors can view.

"It was part of what we call the 'breadbasket of New York,' where we fed most of Manhattan," says Byron Saunders of the Wyckoff Farmhouse Museum. "Queens and Brooklyn were all farms from the 1600s up until about 1908. Then all of a sudden in about 30 short years, Brooklyn became a bedroom community where there were no more farms. We are the last remaining farm."

This weekend's events also features free tours, lectures, and other history-related events, such as the Richmond County Fair on Staten Island and the Antique Motorcycle Show at the Queens County Farm Museum.

For more information and a list of all the houses, visit historichousetrust.org.