Jerash, located in northern Jordan is considered one of the most well-preserved sites of Roman architecture in the world outside Italy. Architects have found ruins that indicate human settlement in this area for more than 6500 years. The city reached its peak under the days of Alexander the Great and Roman rule as one of the ten cities of the Decapolis.
In modern times, an emergency camp was set up in 1968 to harbor refugees of the Arab-Israeli war. The Jerash camp initially sheltered 11,500 Palestinians and over time the original tents were replaced with poorly constructed shelters. Today, the Gaza refugee camp in Jerash is home to 24,000-34,000 Palestinian refugees. For photos of the camp, I recommend this site: http://www.flickr.com/photos/einkarem1948/sets/72157620424425144/