United NationsApprox. Time: 2 hours
Activity Level: Easy to Moderate

The stately and art-filled United Nations Headquarters may be explored on a tour ($7.50) or by yourself. You'll see the General Assembly building where all the 189 member countries meet to discuss pressing issues, the looming Secretariat building (consisting of 39 floors), the Conference building, and the Dag Hammarskjold Library. Prized must-sees include the gifted art works from Norman Rockwell and Marc Chagall, the Chinese Ivory Carving, the intriguing Foucault Pendulum, and the sculpture garden. A popular activity is writing out postcards and sending them to your friends bearing the unique United Nations stamp that is only accepted when mailed from the UN Headquarters.