Question 1
This white marble tomb in northern India was built in the 1600s by a Mughal emperor for his favourite wife, who died giving birth to their 14th child. Its perfectly symmetrical dome and four corner towers are reflected in a long water channel. It took more than 20,000 workers about 20 years to finish. 
Question 2
This large, brilliant-white Japanese hilltop fortress has a maze of walls, gates and courtyards leading up to a soaring central keep of six visible storeys. Built in its present form around 1609, it is nicknamed the 'White Heron' for its shape and colour, and it survived centuries of war, earthquakes and wartime bombing almost untouched. 
Question 3
This huge oval stone amphitheatre in the centre of an Italian capital could hold tens of thousands of spectators for gladiator fights, animal hunts and public executions. Opened in AD 80, it had a retractable awning for shade and could even be flooded for mock sea battles. Earthquakes and stone-robbing left it half-ruined. 
Question 4
This pair of matching 88-storey skyscrapers in Kuala Lumpur, Malaysia, is joined near the middle by a two-storey sky bridge that visitors can walk across. Their pointed steel-and-glass tops are shaped after patterns in Islamic art. From 1998 to 2004 they were the tallest buildings in the world. 
Question 5
This crossing over the Thames in London has two tall stone piers linked by high walkways, and a roadway in the middle that splits and lifts up to let tall ships pass. It opened in 1894 and is often confused with an older, plainer crossing just upstream. 
Question 6
Dozens of steep, narrow, flat-topped pyramids, far smaller and much pointier than the famous Egyptian ones, stand in rows on desert dunes in Sudan. They were royal tombs of the kingdom of Kush, built between about 300 BC and AD 350, and each once had a small offering chapel attached to its east side. 
Question 7
This medieval abbey sits on top of a small rocky cone rising out of tidal flats off the coast of Normandy, in northern France. At high tide the sea surrounds it and cuts it off; at low tide people once crossed the sand on foot, sometimes fatally. A causeway now links it to the mainland. 
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