Surprise, surprise. Rome is slightly north of Chicago.
Here is a list of all the replacements:
Fairbanks, Alaska : Reykjavik, Iceland
Anchorage, Alaska : Tampere, Finland
Juneau, Alaska : Linköping, Sweden
Vancouver, Britsh Columbia : Nuremberg, Germany
Seattle, Washington : Zürich, Switzerland
Portland, Oregon : Milan, Italy
San Francicso, California : Athens, Greece
San Jose, California : Seville, Spain
Los Angeles, California : Rabat, Morocco
San Diego, California : Tripoli, Libya
Sacramento, California : Lisbon, Portugal
Las Vegas, Nevada : Malaga, Spain
Chicago, Illinois : Rome, Italy
Detroit, Michigan : Sofia, Bulgaria
Boston, Massachusetts : Dubrovnik, Croatia
New York City, New York : Naples, Italy
Houston, Texas : Kuwait City, Kuwait
Dallas, Texas : Tel Aviv, Israel
El Paso, Texas : Marrakesh, Morocco
San Antonio, Texas : Beni Suef, Egypt
Tijuana, Baja California : Benghazi, Libya
Miami, Florida : Dubai, United Arab Emirates
Jacksonville, Florida : Cairo, Egypt
Tampa, Florida : Las Palmas, Spain
Orlando, Florida : Santa Cruz, Spain
Gjoa Haven, Nunavut : Murmansk, Russia
Naujaat, Nunavut : Rovaniemi, Finland
Taloyoak, Nunavut : Tromsø, Norway
Tucson, Arizona : Safi, Morocco
Phoenix, Arizona : Casablanca, Morocco
Albuquerque, New Mexico : Heraklion, Greece
Oklahoma City, Oklahoma : Nicosia, Cyprus
Milwaukee, Wisconsin : Marseille, France
Minneapolis, Minnesota : Belgrade, Serbia
Whitehorse, Yukon : Helsinki, Finland
Yellowknife, Northwest Territories : Alesund, Norway
Inuvik, Northwest Territories : Narvik, Norway
Winnipeg, Manitoba : Lviv, Ukraine
Thompson, Manitoba : Moscow, Russia
Calgary, Alberta : London, UK
Edmonton, Alberta : Hamburg, Germany
Fort McMurray, Alberta : Riga, Latvia
Grande Prairie, Alberta : Copenhagen, Denmark
Toronto, Ontario : Florence, Italy
Sudbury, Ontario : Geneva, Switzerland
Thunder Bay, Ontario : Paris, France
Quebec City, Quebec : Ljubljana, Slovenia
Montreal, Quebec : Zagreb, Croatia
Saskatoon, Saskatchewan : Amsterdam, The Netherlands
Regina, Saskatchewan : Brussels, Belgium
Washington, District of Columbia : Alicante, Spain
Boise, Idaho : Toulouse, France
Billings, Montana : Lyon, France
Fargo, North Dakota : Lausanne, Switzerland
Denver, Colorado : Valencia, Spain
Kansas City, Missouri : Palma, Spain
St. Louis, Missouri : Izmir, Turkey
Omaha, Nebraska : Barcelona, Spain
New Orleans, Louisiana : Tiznit, Morocco
Little Rock, Arkansas : Limassol, Cyprus
Jackson, Mississippi : Haifa, Israel
Atlanta, Georgia : Beirut, Lebanon
Nashville, Tennessee : Mersin, Turkey
Charlotte, North Carolina : Tehran, Iran
Virginia Beach, Virginia : Tunis, Tunisia
Indianapolis, Indiana : Cagliari, Italy
Louisville, Kentucky : Palermo, Italy
Philadelphia, Pennsylvania : Ankara, Turkey
Pittsburgh, Pennsylvania : Madrid, Spain
Hermosillo, Sonora : Guelmim, Morocco
Monterrey, Nuevo Leon : Doha, Qatar
Cleveland, Ohio : Istanbul, Turkey
Cheyenne, Wyoming : Porto, Portugal
Whichita, Kansas : Murcia, Spain
Des Moines, Iowa : Zaragoza, Spain
Sioux Falls, South Dakota : Split, Croatia
Providence, Rhode Island : Tirana, Albania
Salt Lake City, Utah : Thessaloniki, Greece