The reason is found in Russian and Georgian migrations when the cold war ended. They brought blond hair and blue eyes that are so surprising to find in Turkey. Many girls from Soviet countries dedicated themselves to prostitution and today, in a derogatory manner, prostitutes are called Nathasa (things that are left to one after reading the Lonely Planet).
We spent a couple of days in the city. On the first day we took it quietly visiting the main streets and drinking a beer, we hadn't seen one for a long time!
During the second day we went to visit the Hagia Sophia, a beautiful Byzantine church with a beautiful garden around it and little else. We wanted to climb the castle but apparently it is in a military zone and the passage is restricted. So we went through the shopping streets and the city bazaar to hang out between shopping and some tea to rest our legs.
A good recommendation on your visit to Trabzon is about climbing the Boztepe Park, it is located on one of the hills that surrounds Trabzon and from it you have great aerial views of the city.
We wanted to go to the monastery of Sumela, an impressive monastery perched on the rock a few kilometers inside Trabzon, but the days were ending and we had to start preparing the return to Istanbul.
The next day we were leaving on a very long bus ride - no more than fourteen hours - that took us back to Istanbul. The flight left at 5 in the morning and we decided not to arrange a hostel. So we walked like zoombies through this huge city. Truly, the city deserved a farewell better than a couple of shattered beings after a good tunda of bus circling for hours through its endless streets. But well, after all, it is always a good excuse to return to the magical Constantinople.