How many wonders of the world are there *really*?

I was just having a ponder about whether there was an official list of the wonders of the world.. so I did a Google search, and that almighty behemoth that is Wikipedia sprung an enormous list of potential wonders on me.. who knew? If you're reading this; sure, you could just go search it up right now. But I'm interested... So I'll speak about it a bit. If you don't mind.

There are apparently 7 Ancient wonders of the world:

1. Great Pyramid of Giza
2. Hanging Gardens of Babylon
3. Statue of Zeus at Olympia
4. Temple of Artemis at Ephesus
5. Mausoleum of Maussollos at Halicarnassus
6. Colossus of Rhodes
7. Lighthouse of Alexandria/ Ishtar Gate

Of course, the only one of these that still exists today is the Pyramid(s) at Giza [which I'm desperate to see, as Egypt is rather high indeed on my list of places I want to go]. It's a little bit depressing to think that there was all of this incredible stuff around as recently as a few hundred years ago, and yet we'll never see them. History's great for a variety of reasons, but as the saying goes, ignorance is bliss. Now I know about all of these ancient monuments, I have an irrational craving to see them. Maybe my true calling in life is as an archaeologist...

Anyway, those are only the ancient wonders; next, the 'later wonders':

1. Stonehenge
2. Colosseum
3. Catacombs of Kom el Shoqafa
4. Great Wall of China
5. Porcelain Tower of Nanjing
6. Hagia Sophia
7. Leaning Tower of Pisa

(others including Taj Mahal appear in other versions of this list)

This group is rather more recognisable to the modern onlooker. But, as I browse them myself, I realise I haven't seen any of these sites despite the fact they do still exist... So what am I doing with myself? I live near Stonehenge, yet I've never even contemplated going! What's wrong with me!!!

Next, the most complicated part... I'll just give you a list of some of the many 'wonders' of the modern world according to different sources:

• Great Wall of China
• Petra
• Christ the Redeemer
• Machu Picchu (YES, I'VE SEEN THIS ONE)
• Chichen Itza
• Colosseum
• Taj Mahal
• Pyramid of Giza

On top of these, there are wonders of the natural world, modern wonders of the world, underwater wonders of the world... The list is seemingly endless

Other than making me realise I want to visit a heap of places in the near future, these lists really do put things into perspective a bit. I feel a bit small.