Söyembikä Tower
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. The tower's construction date is enshrouded in mystery. Several scholars date its construction to the turn of the 18th century, when tiered towers were exceedingly popular in Russia. A legend postulates that the tower  was built more than a century earlier by Ivan the Terrible's artisans in just a week's time. As the legend goes, the Kazan queen Söyembikä threw herself down from the highest tier, hence the name. This legend has nothing to do with the real history of the tower because Söyembikä was forcibly detained by Muscovite forces in 1551 and moved to the city of Kasimov and died years later (and suicide is an unpardonable sin in the queen's Muslim faith). The legend was popular since the early 18th century. Some even go as far as stating that  the tower is the only extant structure from the pre-Russian Tatar citadel. If the tower really reflects some original features of Tatar architecture, then its design should have certainly influenced that of the Kremlin towers in Moscow. Supporters of the theory point out that the only similar structures were built in Central Asia, which was politically and culturally connected with the derelict Khanate of Kazan. Several facts point to the validity of this theory: the size of the masonry, the absence of documentary evidence supporting Russian building, the respect paid to the tower by the local Tatar population, and  so forth. In the Imperial period, the tower used to be topped with a double-headed eagle, which the Bolsheviks replaced with a red star. It is currently crowned with a Muslim crescent. In the early twentieth century, the architect Alexey Shchusev reproduced the structure's outline in the Kazan Rail Station of Moscow.