The correct answer is Gol Gumbaz. The Gol (Round) Gumbaz (Dome) is the mausoleum of Muhammad Adil Shah II of the Adil Shahi dynasty of Bijapur. Gol Gumbaz is the second-largest dome ever built, next in size only to St Peter‚¬„¢s Basilica in Rome. Gol Gumbaz:Gol Gumbaz is the most famous monument in Vijayapura. It is the tomb of Mohammed Adil Shah (ruled 1627‚¬€œ1657). A particular attraction in this monument is the central chamber, where every sound is echoed seven times. Another attraction at the Gol Gumbaz is the Whispering Gallery, where even minute sounds can be heard clearly 37 meters away. Its vast dome is said to be the Second Largest dome, unsupported by pillars, in the world, after St. Peter‚¬„¢s in the Vatican City of Rome. Important PointsNeela Gumbad:The Nila Gumbad is one of the earliest Mughal era structures and was built in 1530. Nila Gumbad was built on an island in the Yamuna, and later, just abutting to it, when Humayun‚¬„¢s Tomb was built in the year 1569-70, Nila Gumbad and other adjoining structures were incorporated in the complex. Chota Imambara:Chota Imambara is one such historical and religious place of Lucknow. Chota Imambara is also known as Hussainabad Imambara. It was built by Muhammad Ali Shah third Nawab of Awadh. The tombs of Muhammad Ali Shah and other members of his family are inside the Imambara. The building is also known as the Palace of Lights because of its decorations and chandeliers during special festivals, like Muharram. Chini Ka Rauza:It is the mausoleum of Mughal emperor Shah Jahan's prime minister, Afzal Khan Aalmi, who was also known as Maula Shukrullah,The mausoleum was built in 1635 in Etmadpur (Agra) and is just a kilometre away from the tomb of Itmad-ud-Daulah. Chini-ka-Rauza is believed to be the first structure in India to have been embellished extensively using glazed porcelain tiles and is regarded by many as a significant landmark in Indo-Persian architecture.