The General Rule
The general rule in the United States is that anyone may take photographs
of whatever they want when they are in a public place or places where they
have permission to take photographs. Absent a specific legal prohibition
such as a statute or ordinance, you are legally entitled to take photographs.
Examples of places that are traditionally considered public are streets,
sidewalks, and public parks. Property owners may legally prohibit
photography on their premises but have no right to prohibit others
from photographing their property from other locations.
SNIP
Members of the public have a very limited scope of privacy rights when
they are in public places. Basically, anyone can be photographed without
their consent except when they have secluded themselves in places where
they have a reasonable expectation of privacy such as dressing rooms, restrooms, medical facilities, and inside
their homes.
Permissible Subjects
Despite misconceptions to the contrary, the following subjects can
almost always be photographed lawfullyfrom public places: (continued)
accident and fire scenes
children
celebrities
bridges and other infrastructure
residential and commercial buildings
industrial facilities and public utilities
transportation facilities (e.g., airports)
Superfund sites
criminal activities
law enforcement officers