can you name any tourist attractions here?
Qutb Complex, Red Fort, Humayun's Tomb etc
Delhi
Qutb Complex, Red Fort and Humayun's Tomb 
who address the delhi as one of the greatest cities in the world UNANSWERABLE where is this place located? In India does it have an ancient history as well? Yes, it was probably inhabited before the second millennium BCE. was it ever colonized? Yes, by the British East India Company is the air polluted over here? Yes, According to the World Health Organization (WHO) Delhi was the most polluted city in the world in 2014. was this the venue of any international games? Yes, Commonwealth Games
wiki:19582592
Delhi [SEP] Tourism
According to Euromonitor International, Delhi ranked as 28th-most visited city in the world and first in India by foreign visitors in 2015. There are numerous tourist attractions in Delhi, both historic and modern. The three UNESCO World Heritage Sites in Delhi, Qutb Complex, Red Fort and Humayun's Tomb are among the finest examples of Indo-Islamic architecture. Another prominent landmark of Delhi is India Gate, a 1931 built war memorial to soldiers of British Indian Army who died during First World War. Delhi has several famous places of worship of various religions. One of the largest Hindu temple complexes in the world, Akshardham is a major tourist attraction in the city.