India is filled with stunning Indo-Islamic structures. Marvel at the intricate arches, carvings, and paintings, not to mention the feats of engineering. Located just around the corner from the Taj Mahal, Agra Fort is the red sandstone fort that was once home to emperors. Qutub Minar is a UNESCO World Heritage Site and the tallest brick minaret in the world. Tipu Sultan Shahi Mosque in Kolkata is one of the most admired mosques in India, it features four minarets and 16 domes. Bara Imambara in Lucknow is known for its unique style and an incredible maze located on the upper floor of the monument.