What construction's apex will be visible above the horizon from more than 40 miles away?

crane?

The Giza pyramids ?

Your phrasing indicates that it is not yet built. The Shanghai World Financial Center, currently under construction, will be 1640' tall. I think that is the tallest under construction. Others, taller, have been discussed, but may never be built. The most interesting one was Wright's Mile High Illinois. Designed in 1956, it would have housed 100,000 people. Wright also designed a city surrounding it first to be used by the construction workers. I just happened to have 'liberated' a March 2003 copy of Popular Science a few weeks ago. See page 60. (The doctor's office will never miss it.)

In light of the 9.11 attacks on the World Trade Center, it may develop that insurers may be very very reluctant to cover these buildings. With no insurance coverage, it is unlikely they will be built. Even with coverage, a few developers have lost interest because of the terrorist possibility.

Once again, in my haste, I made a mistake. What I thought was an ad in the magazine was actually a fold-out with details of a 1666' building to be finished late thise year, and occupied in 2004. The Taipei Financial Center will be 1666 feet tall, beating even the tallest estimate of the Shanghai World Financial Center.

Nope sorry guys.

Dorian this "structure" is not yet built,you are right on that point, here's a clue it will be over three times higher than the Eiffel tower.

I don't think this is what your talking about, but angel falls is often described as being 3 times higher then the eiffel tower....

Could it be the tower to be built in the outback of New South Wales in Australia to be completed by 2006? Supposedly, it will be the tallest structure in the world.

http://pacific.bizjournals.com/pacific/stories/2003/01/06/daily22.html

Yes ,Kellygirl that's the one. A 1 Kilometer solar tower high (3280 feet), Thanks for your link , I am joining mine because it has a picture. In fact if you go to google and type "solar tower Mildura" you'll find a multitude.

http://www.visionengineer.com/env/solar_flue2.shtml

There are several already in existance (as well as at least some of those mentioned) that meet the original question's requirements.


For a person whose eye level is 5'8" off the ground...

For something to be just barely visible at 40 miles away, it would need a height of only 917 ft (less than the height of the Eiffel tower)

For a height of 3280 feet, the building would actually be visible from 73 miles away (as far as height plays into it anyway).

You're right Methos , according mathematicaly to an ideal flat piece of land, but since the site mentioned 65 KM, I did not want to change anything in case of being wrong on land relief, land is rarely flat, even in a desert or in the forest, although the area seemed to be flat.

I should have included that that was in the ideal case, but I was just pointing out that the question was pretty vague and could have several answers. I know for a fact that the Sears tower (in a pretty flat state) and the CN tower (by the edge of Lake Ontario) are both visible from 40+ miles away.

Maybe the question sould have been formulated otherwise,but I didn't want to give it away too easily either.

And then again , the question was referring for future structures , non already existing ones.

"What construction's apex WILL be visible above the horizon from more than 40 miles away"?[quote]