This weekend is Open House New York, always a highlight of the year for the last five years. You get to explore places that are normally closed to the public (and sometimes kind of condemned).
Highlights from my weekend:
Checking out Ellis Island's restored Ferry Building, where the old ferry "Ellis" sank in the 1960s (and you can still see some of it sticking up through the water surface)
Rubble outside the abandoned psychiatric hospital
broken glass windows in the stabilized walkways between the various sections of the abandoned hospital
hanging light socket in the old staff's quarters
toilet in the old Contagious Diseases Hospital
Washed rind cave in the basement of Murray's Cheese
More moldy cheese in Murray's Cheese cheese cave - stinky but well-worth standing in line for the wait list
There were tons of other things I wanted to do - canoe the Gowanus, explore an MTA Substation - but they were all on Saturday and I couldn't fit everything in. Sunday I decided to go to the mall and do a very different kind of urban exploring (resulting in shoes and lots of Halloween crap from Target).