Celtic versus Rangers is one of the fiercest rivalries in world football.The coming together of the two communities of Glasgow in Scotland, in the cauldron of a stadium to cheer on their sides, as well as proclaim their identity with songs and banners, creates a unique and febrile atmosphere. On one side of the arena the red, white and blue of the British Union Flag. On the other the green, white and orange of the Irish tricolor flag. Getty Images
Last season the family of Celtic's Catholic manager Neil Lennon were put under 24-hour police surveillance following live ammunition and a parcel bomb being sent to him in the post. Getty Images
Rangers current manager is former club goal-scoring legend Ally McCoist. He led the side to the title last season but could not avoid the side being subject to a UEFA ban after sectarian songs were sung in a match against Dutch side PSV Eindhoven. Getty Images
The imposing 1920s facade of the main stand at Ibrox Stadium, home ground to Rangers Football Club, a club who have won the Scottish title 54 times in their history. It was here that the biggest attendance for a soccer match in Britain was set in 1939, when 118, 567 turned out to watch an "Old Firm" game against Celtic.
Robert Marshall, the proud landlord of The Louden Tavern, a pub that sits close to Ibrox Stadium in Glasgow, Scotland and is overt in its support of Rangers Football Club. Paul Devitt
The call The Louden Tavern a drinking hole would be a disservice, it would be more accurate to call it a shrine. How many bars do you know with stained-glass windows in honor of footballers? Paul Devitt
The Louden Tavern is just around the corner from the Glasgow Orange Order -- a Protestant fraternity who still march once a year to celebrate the victory of King William III over the Catholic King James II in 1690 at the Battle of the Boyne Paul Devitt
Bairds Bar on the Gallowgate road in Glasgow, Scotland. The pub is a popular stopping point for the faithful followers of Celtic on their way to the match. Paul Devitt
Tommy Carberry at work in Bairds Bar. "There are no Rangers supporters that come in here, so nobody will be offended by what is being sung. Same with Rangers' pubs," said Carberry. Paul Devitt
One of the large stands at Celtic Park, the 60, 000-seater home stadium of Celtic Football Club. The arena has been dubbed "Paradise" by the fans, many of whom travel from Ireland each fortnight to see the "Bhoys" play at home. Paul Devitt
A statue commemorating Jock Stein at Celtic -- the manager who led a team comprised entirely of players from the Glasgow area to European Cup glory in 1967. Paul Devitt
"Unfortunately, when you go to these fixtures you'll hear some of the most horrific chanting of a sectarian nature which is aimed wholeheartedly at offending people from another religious persuasion," Campbell Corrigan, Assistant Chief Constable for Strathclyde Police. Paul Devitt