True. Construction of the Taj Mahal took approximately 22 years (1631-1653). It employs white marble inlaid with semi-precious stones, calligraphy, and symmetrical gardens. The main dome rises 35 meters (115 ft). It is a UNESCO World Heritage Site and one of the New Seven Wonders of the World.

False. Despite widespread myth, the Great Wall of China is not visible from space with the naked eye. Astronaut Yang Liwei (China's first astronaut) confirmed this in 2003. The wall is too narrow (average 6-7 meters wide) and follows natural terrain contours. Only large structures like cities or the Giza Pyramids are barely visible.

True. Machu Picchu sits at 2,430 meters (7,970 ft) above sea level. It was abandoned about 100 years after construction, likely due to smallpox brought by Spanish invaders. It was never found by the Spanish, so its structures remained largely intact. Hiram Bingham brought it to international attention in 1911.

True. Completed in 1931, the statue weighs 635 metric tons. It is made of reinforced concrete and covered with 6 million soapstone tiles. It stands atop Corcovado Mountain at 710 meters (2,330 ft). It was voted one of the New Seven Wonders of the World in 2007.

False. The Colosseum (Flavian Amphitheater) was specifically designed for gladiatorial contests, animal hunts, executions, and mock naval battles (naumachiae). It opened in 80 CE and could hold 50,000-80,000 spectators. It had a retractable canvas awning (velarium) and an underground hypogeum with trapdoors and elevators.

True. Gustave Eiffel's tower was only meant to stand for 20 years. Its survival was due to its usefulness as a radio antenna (military communications during WWI). It stands 330 meters (1,083 ft) tall today. It is painted in three shades of "Eiffel Tower Brown" (lighter at the top for visual consistency).

True. Petra was established as early as 312 BCE. It was a crucial trading hub for frankincense, spices, and silk. The city has over 800 individual monuments, including tombs, temples, and a 6,000-seat theater. Al-Khazneh is actually believed to be a mausoleum or ceremonial hall, not a treasury.

False. Stonehenge was built in multiple phases over about 1,500 years (3000-1500 BCE). The Druids (Celtic priests) appeared around 300 BCE, much later. The builders remain unknown. It aligns with the summer and winter solstices. Many stones were transported from Wales (about 225 km/140 miles away).

True. Utzon won an international design competition in 1957. Construction began in 1959 but was plagued by cost overruns and engineering challenges (the "sails" required innovative spherical geometry). Utzon resigned in 1966 and never returned to Australia. The building was completed in 1973. It is a UNESCO World Heritage Site.

False. Angkor Wat was built as a Hindu temple dedicated to Vishnu in the early 12th century by King Suryavarman II. It gradually transformed into a Buddhist site later. It is the largest religious monument in the world (covering 162.6 hectares/402 acres). Its central tower rises 65 meters (213 ft) above the ground.