Another would have to be The Internet.

1 Apollo program, 2 Panama Canal, 3 US Interstate Highway System, 4 Eiffel Tower, 5 Hoover Dam, The next 2 have yet to be built.

Wow, no respect for some golden oldies?

The Globe Theatre in London, THE most important theatre ever (SHAKESPEARE'S!) from 1599-163, 1614-1642, and the reconstruction of it now from 1997 to the present...

Notre Dame Cathedral in Paris...

The Taj Mahal in Agra...

The Statue of Liberty in NYC...

The Empire State Building in NYC...

The Eifel Tower in NYC...

The Forbidden City in Beijing....

7 Greats right there...

The Eifel Tower in NYC? That is a truly wonderful answer...

The US Interstate Highway System? Really??? I'd say it inspires frustration more so than wonder. The Hoover dam may well have been a wonder when it was built, but now it is just one of several large dams... It's tricky, is this...

The International Space Station

The internet

The (I can't believe I'm saying this...) European Union

GPS

International flight paths/international flight/call it what you will

Clockwork and the timezones they tick in

To hell with the rules! The pyramids!

The Big Pineapple near Nambour (Queensland, Australia)
The Big Banana at Coffs Harbour (NSW, Australia)
The Big Prawn (Ballina, NSW)
The Big Cow (somewhere in NSW, I can't remember where)
The Big Cherry (somewhere in Victoria)
I am running out of ideas here, but all of the above are wonders of fibreglass construction and major tourist attractions.
Houses of Parliament in London is a very nice building.
The Golden Gate Bridge is very nice.

1)The Grand Canyon
2)The Space Station
3) Standing at the 'Western Wall', looking up at the Dome Of The Rock.
4) The internet
5) Tivo (and its bastard children)
6) The iPod (and its parents)
7) My son :P

If its okay I might substitute one of my suggestions above (the Big Prawn is overated).
Ankor Wat in Cambodia - this really should be on any post 1000 AD list.

That should read *Angkor Wat

Angkor Wat: 800 AD to 1200 AD - it crosses the age barrier.

Really? Wikipedia says it was built during the 12th century. I have another source TTC audio course - Human Prehistory and the First Civillizations by Professor Brian M. Fagan
which says that it was built for King Suryavarman II in A.D. 1117.

I just read a little more: the Angkorian period dates from 802 A.D. but I think the temple was built much later.

The Great Wall as we know it was built by the Ming. The old Great Walls were in different positions (take a look at http://upload.wikimedia.org/wikipedia/commons/9/9 /Map_of_the_Great_Wall_of_China.jpg). It is only the idea that was reused, so I think it should count.
Note that I didn't vote for anything.

London Underground - and more specifically the London Underground (tube) map, which is seen as a British icon.

Brooklyn Bridge.

Concorde.

The motor car.

No love for Machu Picchu?

Ha ha with that link. Try http://en.wikipedia.org/wiki/File:Map_of_the_Great_Wall_of_China.jpg.

Prolly

Machu Picchu
Angkor Wat
Chichen Itza
Burj Dubai
Panama/Suez Canals
Oh hell idk

Oh the Chunnel yes!!!
and uh... the proposed bridge across the bering strait, whenever they build it.

Eiffle Tower
Britain's canal system c1700 -main artery of the industrial revolution.
Panama/Suez canals
The Concorde.
The Saturn Five (I believe the final version is still the most powerful machine ever made).
Clockwork.
The integrated circuit

The Human Genome project

er... oops that's Eiffel Tower in PARIS... lol.

I like The International Space Station as One, that IS really something pretty incredible... maybe swap that and the Empire State Building...

And Machu Picchu? I will NEVER understand why it's considered a Wonder... looks neat, but is it REALLY so significant as the GLOBE THEATRE (Shakespeare's plays) Statue of Liberty (Symbol of America) Eiffel Tower (Symbol of France) Notre Dame Cathedral (So epic even atheists might say it's awesome) The Forbidden City (Cultural AND has a really cool title... FORBIDDEN, that just adds to the mystique) Taj Mahal (a globally recognized structure like the Eiffel Tower or Statue of Liberty) or the International Space Station (Men living IN SPACE... that's pretty special.)

Also- come ON,

TEAM USA... down 1-0 early? come on!

hubble telescope

its more like... not what the structure means, but just the physical impressiveness.

so that rules out paltry structures like Statue Liberty, Eiffel Tower, Notre Dame, etc.

Masjid al-Haram, largest mosque in the world and means an awful lot to a lot of people.
how about the Large Hadron Collider ?

I don't quite see what we're aiming for here.
Still, for me it would probably be:

Eiffel Tower - hard to say as a Brit though!
CN Tower
Iron Bridge [http://en.wikipedia.org/wiki/The_Iron_Bridge - first large-scale use of iron]
Suez Cannal - without it the world would have been a very different place, as a lifeline of the British Empire.
Golden Gate - just looks beautiful.
Statue of Liberty - (just ahead of Christ the Redeemer)
Taj Mahal
those would probably be my suggestions

@Octavious Your thinking of the less than 10% of the milage near large metro areas. It was never made for local traffic thus the name Interstate. The remaining 90% carries the life blood of the US economy. The only thing comparable is the Roman road system.

@figlesquidge:

Really... the whole British Empire's a Wonder? ALL of it? The whole nation, from Big Ben and the Queen to some broken toilets in a Yorkshire slum and a couple prostitues?

EVERY bit of the Empire...? Come on, even we Americans have to admit that theirs parts of our country that are SHIT... the dealers and gangsters and broken EVERYTHING in East Los Angeles, for example. ;) *Ducks as offended East LA gangsters who have the intellect and free time to come onto Diplomacy... oh, wait...*

;)

Also, it IS the meaning of the structure and NOT just the size or complexity of it!

Look at the OLD Wonders- Pyramids were for pharoahs and gods, Temple of Zues was for their chief God, Hanging Gardens for their king and his wife, Colossus also I believe for gods...

So I'd say the meaning behind the NEW Colossus (Statue of Liberty, which you better not call paltry or cheap in the States!) or the meaning of Notre Dame Cathedral (insult it and God AND a Hunchback will get you) or the Globe Theatre (you think saying "MACBETH" is bad luck, just try and insult the Globe...) is pretty significant, and MUST be taken into account...

And that's why Statue of Liberty beats Empire State Building or CN Tower or Sears Tower... bigger meaning CAN sometimes trump bigger structure...

And as impressive as the Interstate IS, it's not Lady Liberty.

The Interstate is very important.

The Statue of Liberty is our international SYMBOL... the test-

Any monster/blow-up-the-world disaster flick you see, what nearly ALWAYS gets knocked down or destroyed if it's taking place in America?

;)