English burg fortified town; akin to Old High German burg fortified place, and probably to Old English beorg hill -- more at BARROW
1 a : a medieval fortified group of houses forming a town with special duties and privileges b : a town or urban constituency in Great Britain that sends a member to Parliament c : an urban area in Great Britain incorporated for purposes of self-government


This is according to Webster's dictionary.  Pittsburgh is the only city, in the U.S.,  that is spelled "burgh".  All others dropped the "h".  Most people know that when you say "Burgh" you are talking about Pittsburgh.  At least in the Ohio Valley.  The City is called Pittsburgh, because the area was founded by William Pitt -- hence Pitt's Burgh.  Because of the natural defenses in the hills surrounding the city and the confluence which made trading easier, the area thrived.  The city's image has been re-invented many times.  The most popular would be the Steel era. 

And just a little football trivia.  Pittsburgh has been to the Super Bowl 5 times.  We have 4 rings.  We have only worn our White jerseys one other time.  That was in the 16-6 win over the Minnesota Vikings.