The Taj Mahal, perhaps the most famous mausoleum in the world, is located in the Indian city of Agra. Add this part of India to your bucket list, because the Taj Mahal is an absolute must. Built entirely of semi-translucent white marble, the wonder of the world and UNESCO World Heritage Site took over two decades to complete. Heartbroken over the death of his second wife and soulmate, Mumtaz Mahal, who died during childbirth in 1631, Shah Jahan was determined to honour his queen with the grandest gesture he could think of — an awe-inspiring mausoleum. Due to overcrowding and preservation issues, India is considering imposing a 40,000 visitor limit per day.