A massive fortification built in the 17th century during the Mughal rule. Itâs renowned for the grand red sandstone wall, the Diwan-i-Aam (Hall of Public Audience), and the Diwan-i-Khas (Hall of Private Audience). To explore this heritage site, fly from Atlanta to Delhi. After that, you can either take a direct cab or a metro to the Chandni Chowk station, which is a short walk from the Red Fort.