It was also the first structure to use red sandstone at such a scale The tomb was declared a UNESCO World Heritage Site in 1993, and since then has undergone extensive restoration work, which is still underway. Besides the main tomb enclosure of Humayun, several smaller monuments dot the pathway leading up to it, from the main entrance in the West, including one that even pre-dates the main tomb itself, by twenty years; it is the tomb complex of Isa Khan Niyazi, an Afghan noble in Sher Shah Suri's court of the Suri dynasty, who fought against the Mughals, constructed in 1547 CE.

Akshardham Temple

Akshardham is a Hindu temple complex in Delhi, India. Also referred to as Delhi Akshardham or Swaminarayan Akshardham, the complex displays millennia of traditional Hindu and Indian culture, spirituality, and architecture. The building was inspired and developed by Pramukh Swami Maharaj, the spiritual head of the Bochasanwasi Shri Akshar Purushottam Swaminarayan Sanstha, whose 3,000 volunteers helped 7,000 artisans construct Akshardham.

The Temple, which attracts approximately 70 percent of all tourists who visit Delhi, was officially opened on 6 November 2005. It sits near the banks of the Yamuna adjacent to the 2010 Commonwealth Games village in eastern New Delhi. The temple, at the center of the complex, was built according to the Vastu Shastra and Pancharatra Shastra. In addition to the large central temple crafted entirely of stone, the complex features exhibitions on incidents from the life of Swaminarayan and the history of India, an IMAX feature on the early life of Swaminarayan as the teenage yogi, Nilkanth, a musical fountain on the message of the Upanishads, and large landscaped gardens. The temple is named after a belief in Swaminarayan Hinduism.

The foundation stone of India Gate was laid by His Royal Highness, the Duke of Connaught in 1921 and it was designed by Edwin Lutyens. The monument was dedicated to the nation 10 years later by the then Viceroy, Lord Irwin. Another memorial, Amar Jawan Jyoti was added much later, after India got its independence. The entire arch stands on a low base of red Bharatpur stone and rises in stages to a huge molding.

During nightfall, India Gate is dramatically floodlit while the fountains nearby make a lovely display with coloured lights. Surrounding the imposing structure is a large expanse of lush green lawns, which is a popular picnic spot. One can see hoards of people moving about the brightly lit area and on the lawns on summer evenings.

The later name, Jama Masjid, is a reference to the weekly Friday noon congregation prayers of Muslims, Jummah, which are usually done at a mosque, the "congregational mosque" or "jāmi' masjid". The courtyard of the mosque can hold up to twenty-five thousand worshippers. The mosque also houses several relics in a closet in the north gate, including an antique copy of the Qur'an written on deer skin.

The vaulted arcade of Chatta Chowk, a bazaar selling tourist trinkets, leads into the huge fort compound. Inside is a veritable treasure trove of buildings, including the Drum House, the Hall of Public Audiences, the white marble Hall of Private Audiences, The Pearl Mosque, Royal Baths and Palace of Color. An evening sound and light show re-creates events in India's history connected with the fort.

A 7 m-high Iron pillar stands in the courtyard of the mosque. It is said that if you can encircle it with your hands while standing with your back to it your wish will be fulfilled. 

Qutab-ud-din Aibak, the first Muslim ruler of Delhi, commenced the construction of the Qutab Minar in 1200 AD, but could only finish the basement. His successor, Iltutmush, added three more storeys, and in 1368, Firoz Shah Tughlak constructed the fifth and the last storey. The development of architectural styles from Aibak to Tughlak is quite evident in the minar. The relief work and even the materials used for construction differ.

There is plaque fixed on one of the structures in the Jantar Mantar observatory in New Delhi that was placed there in 1910 mistakenly dating the construction of the complex to the year 1710. Later research, though, suggests 1724 as the actual year of construction. The primary purpose of the observatory was to compile astronomical tables, and to predict the times and movements of the sun, moon and planets. Some of these purposes nowadays would be classified as astronomy.