Qutub Minar, the 239ft sandstone tower is an Indo-Islamic architectural wonder of ancient India. The complex has a number of other important monuments- the gateway built in 1310, the Alai Darwaza, Quwwat-ul-Islam Mosque; one of the oldest existing mosques in India, the tombs of Altamish, Alauddin Khilji and Imam Zamin.

King Qutb-ud-din Aibak of Slave dynasty laid the foundation of the Qutub Minar in 1199, adjoining the Quwwat-ul-Islam mosque. Qutb-ud-Din completed the first storey. Second, third and the fourth were completed by his successor and son-in -law, Illtutmish in 1230. The Minar was first struck by lightening in AD 1368 and the fallen top storey was replaced by two storeys, the fourth and the fifth in 1370 AD by Feroz Shah Tughlaq (AD 1351-88).

Qutub Minar with a height of 72.5m (239ft) is the highest stone tower in India and has a diameter of 14.32 metres at the base and about 2.75 metres at the top. The first three storeys are made of red sandstone and are heavily indented with different styles of fluting, alternately round and angular on the bottom floor, round on the second and angular on the third. The fourth and fifth floors are made of marble and sandstone. 

5 Kms south-east of Connaught Place, Humayun's tomb is not only a beautifully built and historically important monument. Its real importance lies is being a precursor to some of the most famous Mughal monuments. It is a distinctively a Mughal monuments with all the tell tale signs like the Char Bagh and high walls enclosing square garden. The lofty mausoleum is located in the centre of the enclosure and rises from a podium with arched openings. The structure is built with red sandstone, but white and black marble has been used to relieve the monotony, the latter largely in the borders.

It is one of the most famous monuments and one of the most visited places in New Delhi. Originally called the All India War Memorial, India Gate is a war memorial in the honour of the 90,000 Indian soldiers who died during the World War I and the Afghan Wars (1919). Designed by Edward Lutyens the monument similar in design to the French war memorial, the Arc-de-Triomphe, was completed in 1931, and the same year the then Viceroy Lord Irwin dedicated the structure to the nation. The arch is a magnificent 42 meter high structure made of red sandstone standing on a low base. The names of the demised soldiers are inscribed all along the walls of the arch. Soon after the 1971 Indo Pak War, a shrine namely Amar Jawan Jyoti (The flame of the immortal warrior) was erected at the base of the India Gate to honour all the soldiers who laid down their lives for protecting the nation. This four faced black marble memorial consists of a rifle placed on its barrel, with a soldier's helmet on top of the bayonet and the words "Amar Jawan" (Immortal Warrior) inscribed in gold on all its faces. It also has four eternally lighted flames to commemorate their brave deeds at the corners of the square base on which cenotaph is placed.

Now known as 'Sansad Bhavan' this circular colonnade building is 171 meter in diameter and 75 feet high. It was designed by Sir Herbert Baker as the building for the the constituent assembly, who sat here for 3 years to prepare the constitution of free India. Now it has houses the Indian Parliament (Lok Sabha and Rajya Sabha) after the independence in 1947. Built on 3 levels, it has a red sand stone foundation, 144 pillars and a small attic. Specially imported acoustic tiles were used on the walls and sound absorbing plaster on the ceiling. The Parliament library is one of the most impressive in Asia. The Parliament house has all the constructive geometric qualities.

Rashtrapati Bhawan, the official residence of the President of India is located at a tree-lined avenue flanked by lawns with orderly flowerbeds and clipped hedges, with the India gate at the opposite end. Designed by Sir Edwin L. Lutyens and completed in 1929, this palatial building was formerly the Vice Regal Lodge, during the British rule.

Built in two shades of sandstone, it covers an area of 18,580 sq meters (200,000 square feet) and is bigger than the Louis XIV's place at Versailles. The total cost for the construction was Rs.1.4 million and over 3,500 men worked on 3.5 million cubic feet of marble and 700 million bricks for 17 years for its construction.

After independence it was re-named Government House later as Rashtrapati Bhavan. Built in a combination of Mughal and classical European architectural styles, it has a huge copper dome surmounting a long colonnade and 340 decorated rooms. There are 31 steps at the entrance to the portico with 20 columns. Across the portico, the Durbar hall (Audience hall), with golden pillars and coloured marble from all parts of India, is 23m in diameter and has an exquisitely carved 2300 year old sculpture of the Ashokan bull at the entrance. There is a 4th century statue of Buddha behind the Presidents chair.