Image: Satellite Image Captures Burj Khalifa, World's Tallest Man-Made Structure
Digitalglobe  /  Getty Images Contributor
Burj Khalifa tower, the world's tallest man-made structure, is shown in this satellite image. The building, in Dubai, United Arab Emirates, is more than 1000 feet taller than the world's second-tallest structure.
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updated 10/28/2011 9:50:54 AM ET 2011-10-28T13:50:54

Those monuments you’ve crossed the planet to see – they’re big, but are they clever? Well, yes, actually they are. These 10 works of engineering genius span the centuries and are guaranteed to boggle the traveler’s brain and leave mouths agape.

1. Great Pyramid of Khufu, Giza, Egypt
Bigger might not be better, but clearly nobody told Pharaoh Khufu that before he built his pyramid in 2570 BC. More than 2 million limestone blocks, each weighing upwards of 2 tons, were hefted to create a beast of a building some 480 feet high — it remained the world’s tallest structure for 4,000 years. But never mind the size: feel the quality. Not only was the design supremely accurate – each 755-foot-long side varies by mere inches — the subtleties of its construction are exceptional: the internal shafts point towards important constellations, for example, and it aligns with true north. Oh, and it looks phenomenal.

The pyramids are open daily; two are usually open to the public. Arrive before 8 am for the best chance of tickets.

2. Aya Sofya, Istanbul, Turkey
No, it doesn’t honor some saintly Sophia — this astonishing construction was named for divine wisdom (sophos in Greek). The name is apt, because the incredible beauty of this ancient building, created by the Byzantine Emperor Justinian in AD 537, was possible only thanks to the cunning of the innovative architects who perched its vast, seemingly floating 98-foot dome on pendentives and hidden pillars. Converted to a mosque after the Ottoman invasion of 1453, Aya Sofya is now a secular monument — but when shafts of sunlight strike the gold mosaics of its cavernous interior, you’ll be forgiven for experiencing a religious moment.

The Aya Sofya is closed on Mondays; come the rest of the week to fully enjoy the wonder of this historic masterpiece.

3. Indian railways
A glance at the numbers gives a sense of what has been achieved since the first train chugged out of Mumbai on the 20 miles to Thane in 1853; today, over 40,000 miles of track carries 18 million passengers daily. But that’s skimming the surface; the real engineering prowess is demonstrated in the small details. For example, in 1874, Major Stanton constructed an 55-mile section — from initial survey to loco commissioning — in a mere 65 days. Such feats were repeated throughout the country and now you can ride on comfortable broad-gauge tracks or switchback up to Himalayan hill stations on toy trains (small mountain trains).

IndRail passes, enabling prebooking of seats and berths, are valid from half-day to 90-day options in three classes.

4. Guggenheim Museum, Bilbao, Spain
Is it a ship? A flower? A fish? Frank Gehry’s vision for this glimmering creation was unique. Call it deconstructivism or, as did King Juan Carlos, simply "the best building of the 20th century;" either way, it continues to astonish. Its flowing, organic lines required a ground-breaking 3-D computer-aided design program, which enabled 60 tons of titanium to form sweeping sheets just a half-millimeter thick and specially strengthened glass to curve smoothly around the limestone carapace. Since it opened in 1997, the museum has hosted a dazzling array of works by the likes of Warhol, Rothko and Koons, but it’s the building itself that has kick-started Bilbao’s renaissance.

Guggenheim Museum Bilbao is open Tuesday to Sunday year-round, and Mondays in July and August.

5. Great Wall of China
Genghis Khan reportedly said: "The strength of a wall depends on the courage of those who defend it." True, but it helps if your wall is really big. The original Great Wall was constructed by the 3rd-century Qin dynasty, which coerced hundreds of thousands of workers into hefting an estimated 235 million cubic yards of rocks and mud. The later effort by the Ming dynasty (14th–17th centuries) incorporated 78 million cubic yards of stone and bricks. Overall, the various walls spanned almost 2000 years of construction, cost millions of lives and stretched more than 4000 miles. No, you can’t see it from the moon but, yes, it is jaw-droppingly impressive.

The sections nearest Beijing tend to be crowded and busy with hawkers; head to Sīmǎtái or Jīnshānlǐng for a less-touristy experience.

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6. Millau Viaduct, France
Concrete: 206,000 tons; steel decking: 36,000 tons — oooh, don’t stop, you saucy devil! No, really, it is exciting: Sir Norman Foster’s viaduct is an example of the practical — prosaic, even — that is also delicately beautiful. Challenged to build a bridge to span the Gorges du Tarn in southern France, engineers created a record-busting feat of technology: 8070 feet long, it incorporates the world’s highest pylons, highest mast and highest road deck. But the reason drivers (and tourists) stop and gawp — and they do — is the sense of lightness and fragility something so huge conveys.

The bridge toll is from €5.02 (US$6.86) but admission to the visitor center, open daily, is free.

7. Lalibela, Ethiopia
A while back, there was a bit of a fad for carving buildings out of rock – think Egypt’s Abu Simbel, Jordan’s Petra, India’s Ellora. But Lalibela takes some topping, not least because the rock-hewn churches are still very much active. Come at Timkat (Epiphany; 19 January) for bustling pilgrims, chanting, incense swirling and a peek at the tabots (holy books). Scores of thousands of workers – some of them heavenly, according to local legend – labored from the 12th century to dig Lalibela’s 11 churches vertically from the ground. Rough-edged they’re not, though; their exquisite carvings and decorations make them visual treats.

Lalibela’s churches are open daily. To avoid catching fleas from their carpets, try dusting your socks with flea powder.

8. Falkirk Wheel, Scotland
Boats: great for floating, not so hot going downhill. As for going up — rubbish. If you’re a boat, and you want to head uphill, say, between Scotland’s Forth and Clyde Canal and the 115-foot-higher Union Canal, what you need is either a series of locks stretching over a mile, or a vast steel contraption that rotates a pair of enormous, water-filled gondolas. Each gondola on the Falkirk Wheel carries boats like you on their up or down journeys. It took 1200 tons of steel, more than 15,000 bolts and a really, really big crane to put the wheel together in 2001.

Hour-long boat trips, including lifts up and down, operate daily and cost £7.95 (US$12.40) for adults.

9. Yaxchilán, Yucatán, Mexico
Maya sites are fascinating — ball courts, pyramids, carved frescoes — and Yaxchilán is cooler than most, perched dramatically above a jungle-clad loop of the Río Usumacinta. A wealthy city during its heyday (AD 680–800), Yaxchilán has exceptional and intricately carved facades and roof combs, but arguably the most interesting feature isn’t even there anymore: a suspension bridge whose 207-foot central span was the world’s longest for 700 years. The existence of the bridge, posited in the mid-1990s as a result of archaeological research and computer modeling, is still debated, but the idea certainly adds to the allure of one of the Americas’ most intriguing ancient sites.

Yaxchilán isn’t accessible by road or rail; hire a motorboat for the 45-minute journey from Frontera Corozal.

10. Burj Khalifa, United Arab Emirates
OK, so this one really is all about the size: the world’s tallest building isn’t huge — it’s simply colossal. In the way Gulf states seem to do things (creating vast artificial islands in the shapes of trees, creating the world’s first seven-star hotel, etc), Burj Khalifa didn’t just sneak past the previous incumbent, it roared ahead. Taiwan’s former champion tower, Taipei 101, is a piddling 1667 feet, while Burj Khalifa is a whopping 2716 feet. It’s so high the air temperature at the top is a full 10 degrees Fahrenheit lower than at its base.

For a closer look, the well-heeled can book a suite at the Armani Hotel, which will occupy the lower 37 floors of Burj Khalifa.

This story, Top 10 works of engineering genius, originally appeared on LonelyPlanet.com.

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