The domain .org is a TLD (Top Level Domain), usually reserved for organisations such as charities etc.
However just because a site has the .org suffix does not mean it is trusted.
The web address of the Luncasterhissary Org is: http://www.wheatland.org
The web address of the Historic Columbian Cemetery Org is: www.savecolumbiancemetery.org
"Org" is short for organization. It is often used when entering a web address.
The web address of the Space Gallery is: http://www.space538.org
The web address of the Usslst 393 is: http://www.lst393.org
The web address of the Gallery 782 is: http://www.gallery782.org
The web address of the Gallery 308 is: http://gallery308.org
The web address of the Woodlawn Plantation is: http://popeleighey1940.org
The web address of the Opus 40 is: http://opus40.org
organization or something like that.
The web address of the Warrensburgh Historical Society is: www.whs12885.org
The web address of the Astoria Riverfront Trolley is: http://www.old300.org