Once a Tatar fortress, it was largely destroyed by Ivan the Terrible. During the 16th and 17th Centuries, Russians reconstructed the Kremlin with new fortifications and Russian institutions (such as the Annunciation Cathedral). Many of the features of the Kremlin reflect Russian influence of that era, and the construction of the parapets and watchtowers is particularly reminiscent of other dominant Russian cities of the time, such as Pskov and Novgorod. The Kremlin has been inscribed on the UNESCO World Heritage list. Entry to the Kremlin is through the white clock tower (the Spasskaya Tower) at the end of Bauman Street. Entry costs 300 Rubles with a guided tour, or 20 Rubles to explore the grounds on one's own. There are several interesting things to see inside the Kremlin, including: