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Top secret(s): the truths behind 10 of the world's great wonders

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 Ever visit an incredible site in some exotic land and wonder how it was built? The notice board just lists a few meaningless dates, or a guide rattles off a bunch of jargon-packed phrases, but you want the real dirt. Here we reveal the ingenious engineering behind 10 of the world's most epic structures – and the little-known facts that lie hidden in their depths.

1. Taj Mahal, Agra, India

The Taj Mahal is widely considered one of the most beautiful buildings in the world. Image by Tetra Images - Bryan Mullennix / Brand X Pictures / Getty Images.

Legend has it that Mughal ruler Shah Jahan ordered the hands of the Taj Mahal builders to be chopped off after it was completed, to prevent them from ever building anything so beautiful again - although no written evidence supports this story. The elegance of the mausoleum can be attributed to clever engineering. To make the Taj Mahal appear perfectly straight from ground level, the architect designed the minarets to slant slightly outward, which also ensured that in the event of an earthquake they would fall away from the mausoleum's precious dome.
Make the trip: get to Agra by train from Delhi (about 2 hours). Entry numbers are limited, so buy tickets the day before at the Archaeological Survey India office, known as the Taj Mahal Office by rickshaw drivers ( The Taj Mahal is closed on Fridays.

2. Burj Khalifa, Dubai, UAE

3. Moai, Easter Island (Rapa Nui), Polynesia

Aliens, druids and everyone in between have been proposed as the builders of Stonehenge. But why was it built? Recent evidence suggests it was constructed to celebrate midwinter, not midsummer as previously thought. Most of the monuments in the area are aligned on sunrise and sunset at midwinter and, by dating pig teeth found at nearby settlements, it's now known that more pork was eaten then to celebrate days getting longer.
And how was it built? Around 2600BC, bluestones were (most likely) floated on river rafts from the Preseli Hills in west Wales. Radioactive dating proves glaciers couldn’t have swept them to Salisbury Plain 40,000 years ago, as once thought. On site, the foot of each stone was levered into a pit, and lintels lifted into place using scaffolding.
Make the trip: drive to Stonehenge from London (under 2 hours) or take the bus from Salisbury (about 40 mins).
6. Great Wall of China, China

No matter what your expectations, a visit to the Great Wall of China will blow you away. Image by Digital Vision / Photodisc / Getty Images

Initially built out of rocks and mud, 16th-century Emperor Jiajing developed the Great Wall into a formidable stone dragon. Millions of workers were recruited from the army or press-ganged into signing up, and worked around the clock, extending the wall and constructing the forts. Records claim that a 3km section was completed in 600 days by just 3000 men. And despite frequent billing as the only man-made object visible from space, the Great Wall can actually be seen only with a hefty camera lens from low Earth orbit.
Make the trip: many portions of the Wall are visitable. For Badaling, take bus 919 from the old gate of Deshengmen in Beijing, about 500m east of the Jishuitan metro; tour buses leave from Tiananmen Square. The Simatai and Jinshanling portions offer a less-touristy experience.

7. Angkor Wat, Cambodia

A traveller’s first glimpse of Angkor Wat, the ultimate expression of Khmer genius, is sure to astonish. Image by Artie Photography (Artie Ng) / Flickr / Getty Images

This empire of temples for a city of 1 million people took more than 300,000 workers just 35 years to build (with the help of 6000 elephants). Most temples take centuries to build, let alone one this size: Angkor Wat is believed to be the largest religious complex in the world. Indeed, Angkor Wat's moat is so vast that it can be seen from space. Each one of more than 3000 seductive nymphs (apsaras) carved on the temple walls is unique and has one of 37 different hairstyles.
Make the trip: fly from Bangkok to Siem Reap; or take a taxi, bus or 6-hour boat from Phnom Penh to Siem Reap.

8. Machu Picchu, Peru

Clinging to a remote ridge high in the Andes, the ancient city of Machu Picchu was built, lived in and deserted in fewer than 100 years – then lost to civilization for centuries. During construction, the Inca didn't use wheels to transport the blocks. Instead it's thought they hauled them up the slopes by hand, as protrusions have been found on a few stones (suggesting grips for workers' hands). Ingenious engineering solutions were used to counteract earthquakes: L-shaped blocks anchored corners together, doors and windows tilted inward, and no mortar was used between stones so that, if shaken, they could move and resettle without collapsing.
Make the trip: there are only two options to get to Machu Picchu: trek it or catch the train to Aguas Calientes, where you take a bus from the ticket office on the main road.
10. Great Pyramid of Giza, Egypt

The Great Pyramid of Giza remained the world's tallest building for 4000 years. Image by Daryl Benson / Stone / Getty Images

The goliath Great Pyramid of Giza, the sole survivor of the Seven Wonders of the Ancient World, was the tallest construction in the world until the Eiffel Tower was built in 1889. It was built to hold just three burial chambers, but required a workforce of around 30,000. Intriguingly, analyses of the living arrangements, bread-making technology, animal remains and ancient graffiti suggest the workers were not slaves as previously thought, but skilled laborers.
Make the trip: take a taxi or bus from Heliopolis in Cairo.  
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