The correct answer to the question is option 2, Hawa Mahal. Hawa Mahal is a monument located in Jaipur, India, and is known for its unique pink-colored facade. The monument was built in 1799 by Maharaja Sawai Pratap Singh and its pink color is a result of the use of pink sandstone in its construction. The Hawa Mahal, also known as the "Palace of the Winds," was designed to allow the royal women to observe street processions and activities while maintaining their privacy. The monument`s intricate latticework and small windows were specifically designed to allow cool air to circulate, giving it the name "Hawa Mahal." Despite its stunning pink color, it should be noted that other options mentioned in the question, such as Taj Mahal, Moti Mahal, and Mumtaz Mahal, are not pink in color.