The Delhi Fort also known as Lal Qil'ah, or Lal Qila is located in the walled city of Delhi, India and became a UNESCO World Heritage Site in 2007.

Mughal Emperor Shahjahan started construction of the massive fort in 1638 and work was completed in 1648.

The Red Fort was originally referred to as "Qila-i-Mubarak" (the blessed fort), because it was the residence of the royal family. The layout of the Red Fort was organised to retain and integrate this site with the Salimgarh Fort. The fortress palace is an important focal point of the medieval city of Shahjahanabad. The planning and aesthetics of the Red Fort represent the zenith of Mughal creativity which prevailed during the reign of Emperor Shah Jahan.

This Fort has had many developments added on after its construction by Emperor Shahjahan. The significant phases of development were under Aurangzeb and later Mughal rulers. Important physical changes were carried out in the overall settings of the site after the First War of Independence during British Rule in 1857. After Independence, the site experienced a few changes in terms of addition/alteration to the structures. During the British period the Fort was mainly used as a cantonment and even after Independence, a significant part of the Fort remained under the control of the Indian Army until the year 2003.

On 15 August 1947, India became an independent nation. This was marked by Jawahar Lal Nehru, the Prime Minister of India, unveiling the flag of independent India on 15 August 1947. This practice of unfurling the national flag with a speech by the Prime Minister on Independence Day continues to this day. Just after World War II, the Red Fort had been the scene of the famous trial of the Indian National Army.

Important Buildings Inside Fort
Diwan-i-Aam
Beyond this gate is another, larger open space, which originally served as the courtyard of the Diwan-i-Aam, the large pavilion for public imperial audiences. An ornate throne-balcony (jharokha) for the emperor.the columns were painted in gold and there was a gold and silver railing separating the throne from the public

Nahr-i-Behisht
The imperial private apartments lie behind the throne. The apartments consist of a row of pavilions that sits on a raised platform along the eastern edge of the fort, looking out onto the river Yamuna. The pavilions are connected by a continuous water channel, known as the Nahr-i-Behisht, or the "Stream of Paradise", that runs through the center of each pavilion.

Zenana
The two southernmost pavilions of the palace are zenanas, or women's quarters: the Mumtaz Mahal (now a museum), and the larger, lavish Rang Mahal, which has been famous for its gilded, decorated ceiling and marble pool, fed by the Nahr-i-Behisht.

Moti Masjid
To the west of the hammam is the Moti Masjid, the Pearl Mosque. This was a later addition, built in 1659 as a private mosque for Aurangzeb, Shah Jahan's successor. It is a small, three-domed mosque in carved white marble, with a three-arched screen which steps down to the courtyard.

Hayat Bakhsh Bagh
To its north lies a large formal garden, the Hayat Bakhsh Bagh, or "Life-Bestowing Garden", which is cut through by two bisecting channels of water. A pavilion stands at either end of the north-south channel, and a third, built in 1842 by the last emperor, Bahadur Shah Zafar, stands at the center of the pool where the two channels meet.