The capital of Iran, Tehran, is a bustling metropolis with numerous alternative names. Tehran is also referred to as "Tehrān-e-Moṭahhar," which translates to "Purified Tehran." Other synonyms include "Tehrān-e-Bāstānī," meaning "Ancient Tehran," and "Tehrān-e-Shāhanshāhi," which denotes "Imperial Tehran." The city's historic name, "Rey," is also sometimes used to refer to Tehran. Additionally, Tehran is known as the "City of 72 Nations" due to its multicultural makeup. Tehran is a city that has undergone significant growth and transformation over the years, and it continues to remain the beating heart of the Islamic Republic of Iran.