Agra Fort, on the Yamuna River was home to the Mughal emperors until 1638 when they relocated their capital to the Red Fort in Delhi. Other names for the fort are Fort Rouge and Red Fort of Agra.
We entered via the Amar Sing Gate
Mughal emperor Akbar rebuilt the fort in 1558. According to the government website, 1,444,000 workers completed the project after eight years in 1573.
Within the red sandstone walls are buildings of white marble including Diwan-i-am
Here's a view of the Taj Majal from the Fort
You can find tourist information at the government website.