Final answer:
St. Petersburg's name changed to Petrograd in 1914, to Leningrad in 1924, and then back to St. Petersburg in 1991. The city is a major cultural center and a historic location in Russia.
Step-by-step explanation:
The city whose name was changed to Petrograd, then Leningrad, and then back to its current name is St. Petersburg. This city was originally the capital of the Russian Empire since the time of Czar Peter the Great in the 18th century. Its name was changed to Petrograd in 1914, reflecting the anti-German sentiment at the onset of World War I. Later, it was renamed Leningrad in 1924 in honor of Vladimir Lenin following the Russian Revolution. Eventually, after the fall of the Soviet Union, the city's name was reverted to St. Petersburg in 1991. The city is recognized as a cultural hub in Russia, known for its significant contributions to arts, history, and as a major tourist destination, despite its tumultuous history, including the devastating siege during World War II that resulted in the death of about one million civilians.