Red Fort
Red Fort is one of the most magnificent palaces in the world. India's history is also closely linked with this fort. It was frorth here ht the British deposed the last Mughal ruler, Bhadur Shah Zafar, marking the end of the three century long Mughal rule. It was also fromits ramparts that the first prime. Minister of India, pandit Jawharlal Nehru, announced to the nation that India was free form colonial rule. The mughal emperor, Shah Jahan, after ruling from Agra for eleven years, decided to shift to Delhi and laid the foundation stone of the Red Fort in 1618. For its inauguration in 1647, the main halls of the palace were draped in rich tapestry and covered with silk from china and velvet from Turkey. With a circumference of almost one and a half miles, the fort is an irregular octagon and has two entrances, the Lahore and Delhi Gates.
Jantar Mantar
Jantar Mantar is an astronomical observatory with masonry instruments, built in 1724 by Jai Singh, the mathematician and astronomer king. The Samrat or Yantra supreme - the largest structure shaped like a right-angled triangle, is actually a huge sun-dial; the other five instruments are intended to show the movements of the sun, moon, etc 
Qutub Minar
The Qutub Minar made of red sandstone rising to the height of 72.5mts is an architectural marvel of the 13th century. Also a must is the visit to Ashoka Pillar dating back to the 5th century. Though made of iron it has with stood the weathers of time.A very interesting belief is assigned to this pillar- Stand with your back to the pillar, and if you can hold your hands around it, then make a wish and it will surely come true.
Raj Ghat
On the banks of the river Yamuna is the Raj Ghat where the father of the nation Mahatama Gandhi was cremated in 1948, soon after India attained it freedom.
Chandni Chowk
One of the main markets of Delhi, Chandni Chowk was once lined with beautiful fountains. But today the place is very crowded and congested. Chandni Chowk is located opposite the Red Fort. The Area has got the Digamber Jain Temple which houses the Birds hospital. On one end of Chandni Chowk is the Fatehpuri Mosque which was erected by the wives of Shah Jahan.
India Gate
Flanked by ornamental ponds and lawns, Rajpath is host to the Republic Day Parade. The two secretariat buildings and Rashtrapati Bhawan on the Raisina hills are located on the two sides of this immensely broad road. Previously the Boat Club, besides the Rajpath, was host to many demonstrations and Rallies. India Gate is towards the eastern end of Rajpath.