There was a time when the Turkish-led Ottoman Empire ruled over a large chunk of Europe. Now some believe the Turks want to bring back those old glory days.
The Turkish government has embarked on a mosque-building campaign throughout Germany.
One new Turkish mega-mosque, the Cologne Central Mosque, has Germans on edge.
When construction on the facility is completed, it will be Germany's largest Muslim house of worship - and one of the largest mosques in all of Europe.
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