Yusupov Palace is a historic palace located on the Moika River in St. Petersburg. It was once the residence of the wealthy Yusupov family and is famous for its association with the assassination of Grigori Rasputin, a controversial figure in Russian history. Visitors can explore the palace's opulent interiors, including the lavish private theater and the basement where Rasputin was killed. The palace also houses a museum showcasing the Yusupov family's art collection and historical artifacts.