name the famous monument in delhi made of red sandstone
Red Fort Constructed in 1639 by the fifth Mughal Emperor Shah Jahan as the palace of his fortified capital Shahjahanabad,[3] the Red Fort is named for its massive enclosing walls of red sandstone and is adjacent to the older Salimgarh Fort, built by Islam Shah Suri in 1546. The imperial apartments consist of a row of pavilions, connected by a water channel known as the Stream of Paradise (Nahr-i-Bihisht). The fort complex is considered to represent the zenith of Mughal creativity under Shah Jahan,[citation needed] and although the palace was planned according to Islamic prototypes, each pavilion contains architectural elements typical of Mughal buildings that reflect a fusion of Timurid and Persian traditions. The Red Fortâ€™s innovative architectural style, including its garden design, influenced later buildings and gardens in Delhi, Rajasthan, Punjab, Kashmir, Braj, Rohilkhand and elsewhere.[2]
Agra Fort Realising the importance of its central situation, Akbar made it his capital and arrived in Agra in 1558. His historian, Abul Fazl, recorded that this was a brick fort known as 'Badalgarh'. It was in a ruined condition and Akbar had it rebuilt with red sandstone from Barauli area Dhaulpur district, in Rajasthan.[citation needed] Architects laid the foundation and it was built with bricks in the inner core with sandstone on external surfaces. Some 4,000 builders worked on it daily for eight years, completing it in 1573.[3]