India’s fourth largest city, according to Wikipedia (here), is Hyderabad, with 6.8 million people. For comparison, the largest US City, New York, has 8 million people. Los Angeles, second in the US, has 3.7 million, Chicago, in third, has 2.6 million, and Portland at 29th has 583,776.
From Wikipedia (here):
Hyderabad is the capital and the largest city of the Indian state of Andhra Pradesh. Located on the banks of the Musi River in the Deccan Plateau, the city is one of the largest in India with an area of 650 square kilometres (250 sq mi)[ having a population of 6.8 million, while the metropolitan area contains 7.7 million residents making it the fourth most populous city and the sixth most populous urban agglomeration in the country. In 2008, the nominal gross domestic product (GDP) of Hyderabad was US$ 60 billion—ranking fourth in India and ninety third in the world. In 2011, the city generates the revenue of 70,000 crore and one-third of the state's revenue tax…..
….As a former capital of largest and richest Princely state of India, and patronage from Nizam's had established local traditions in drama, art, theater, literature, architecture and cuisine attracted wide settlement in Hyderabad…..The city is a regular tourist hotspot and home to many historical sites and places of interest, including the UNESCO Asia Pacific Heritage site of Chowmahalla Palace, other famous landmarks include the Charminar and Golconda fort. Hyderabad is home to numerous museums, Bazaars, galleries, libraries, sporting events and other cultural institutions, including the Salarjung museum, Laad Bazaar, Hyderabad International Convention Centre (HICC) and Shilpakala Vedika.
Hyderabad—which was once a global center of the diamond and pearls trade, for which it is known by the sobriquet City of Pearls. Since 1990's Hyderabad is among the global city, with strengths in the commerce, education, entertainment, healthcare, professional services, research and transport—all contributing to its prominence. The city has significantly emerged as a global hub for the information technology industry. The city is also known as Genome Valley of India due to the prominence of Pharmaceuticals and biotechnology industry. Hyderabad International Airport is among the world's top airports for serving 5–15 million passengers and the world's fifth best airport. Hyderabad's 13 universities and business schools form one of the largest concentration of higher education and research in India. In 2012 Hyderabad will host the Convention on Biological Diversity (2012 COP 11), a largest international event ever held in India. The city is home to the Telugu film industry known as Tollywood.
There are additional parts to this last video on exploring Hyderabad.