thumb|A side view
Söyembikä Tower (; ), also called the Khan's Mosque, is probably the most familiar landmark and architectural symbol of Kazan.
Once the highest structure of that city's kremlin, it used to be one of the so-called leaning towers. By 1990s, the inclination was . Diverse stabilization methods were used to straighten the tower in the 1930s and 1990s, and it no longer leans. when tiered towers were exceedingly popular in Russia. Some scholars believe that the tower may date further back than the 18th century.