5. City Hall

Completed in 1812, New York’s City Hall is one of the oldest City Halls in the nation still serving its original purpose. It is the third home of New York City’s government, in addition to a National Historic Landmark and a New York City Landmark. Furthermore, the rotunda, lit by a central oculus and graced by a “floating” staircase, is an New York City interior landmark.

Before you visit during Open House New York, read our guide to the secrets of City Hall so you know what to look for.