Certainly, I can bo my best to answer that for you! 

There were indeed only 6 Wonders of the Ancient World at some point in time.  However, this may have actually happened more than once--and may have involved more than one Wonder being the odd one out--so there is more than one list of 6 Wonders of the Ancient World!   Allow me to explain:

The first time may have happened around 280 BC, when one could say only 6 Wonders of the Ancient World existed, since the **Colossus of Rhodes** was completed in this year, and the **Lighthouse of Alexandria** was likely not yet completed (and may or may not have even been begun, as the dates and details of construction are uncertain).  

One could say that, after 228 BC, there were once again only 6 Wonders of the Ancient World, as the **Colossus of Rhodes** was toppled by an earthquake in that year.  However, remains of the Colossus would lay on the ground for over 800 years and, even broken, they were so impressive that many people travelled from afar to see them.  Thus, most consider the Colossus remains to have still been a Wonder of the Ancient World (until they were stolen and melted down for the bronze much much later in 653 AD), and so it is widely held that there remained 7 Ancient Wonders well after 228 BC.

It could also be that there were never really more than 6 Wonders in the first place! This view is sometimes explored because no physical evidence has so far been found of the **Hanging Gardens of Babylon**. All others have left some sort of trace.  Nonetheless, the Hanging Gardens' existence (and status as an Ancient Wonder) is attested to by multiple ancient historians, and so the question remains controversial.  It is also unknown when the Hanging Gardens may have been destroyed, if they existed.  Sometime in the first century AD is most commonly cited for its end.  As no remains have ever been found, some people even believe the Hanging Gardens of Babylon are still out there to be discovered, though this is not widely accepted.

So from around 1 AD onward there would be once again only 6 Wonders of the Ancient World until the second destruction of the **Temple of Artemis at Ephesus** in 262 AD by the Goths.  Although, like the Colossus, a few consider the Temple's remains to have been impressive, or that the Temple site continued to be used.  This could have only continued until the Christian persecutions of pagan worship in the Late Roman Period.  For certain the Temple was closed by the mid-5th century AD, and the name of Artemis erased from inscriptions throughout the city.  Even supposing the Hanging Gardens of Babylon somehow had persisted through this time, there could only be exactly 6 Wonders of the Ancient World not much longer than this. This is because the same fate would have befallen the **Statue of Zeus at Olympia**, and the temple to Zeus in which it resided.  The statue was lost and destroyed before the end of the 5th century AD, though with conflicting accounts of the exact date and circumstances.

Taking all of this into account, there are several plausible possibilities for a 6 Wonders of the Ancient World list:

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##### Between constructions or completions of the Colossus of Rhodes and the Lighthouse of Alexandria 
1. Great Pyramid of Giza
2. Hanging Gardens of Babylon
3. Statue of Zeus at Olympia
4. Temple of Artemis at Ephesus
5. Mausoleum at Halicarnassus
6. Colossus of Rhodes

*This list almost certainly occurred at one point, probably 280 AD, though the exact date range is both uncertain and depends upon whether and how you count construction or completion. This period is no earlier than 292 AD, and no later than 247 AD.*

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##### From the time of the fall of the Colossus of Rhodes (if the remains of the Colossus are not counted as a Wonder), until the destruction of the Hanging Gardens of Babylon or the Temple of Artemis at Ephesus
1. Great Pyramid of Giza
2. Hanging Gardens of Babylon
3. Statue of Zeus at Olympia
4. Temple of Artemis at Ephesus
5. Mausoleum at Halicarnassus
6. Lighthouse of Alexandria

*This list is a matter of taste. Those that consider the remains of the fallen Colossus an Ancient Wonder find this list invalid.  If valid, this list would apply from 228 BC until sometime within the first through fifth centuries AD, depending on the end of the other Ancient Wonders.*

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##### If the Hanging Gardens of Babylon were mythological 
##### OR 
##### From the time of the destruction of the Hanging Gardens of Babylon until the destruction of the Temple of Artemis at Ephesus 
1. Great Pyramid of Giza
2. Statue of Zeus at Olympia
3. Temple of Artemis at Ephesus
4. Mausoleum at Halicarnassus
5. Colossus of Rhodes
6. Lighthouse of Alexandria

*If the Hanging Gardens of Babylon were mythological, this list could have occurred from 280-247 BC (the completion of all six of the above) until the destruction of the Temple of Artemis at Ephesus (some time between 262 AD and the end of the fifth century AD). If the Hanging Gardens did exist, the date range for this list begins later, with the Gardens' destruction, possibly as early as 1 AD.*    

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##### From the time of the destruction of the Temple of Artemis at Ephesus (if the Hanging Gardens somehow outlasted the Temple of Artemis) until the destruction of either the Statue of Zeus at Olympia or the Hanging Gardens of Babylon 
1. Great Pyramid of Giza
2. Hanging Gardens of Babylon
3. Statue of Zeus at Olympia
4. Mausoleum at Halicarnassus
5. Colossus of Rhodes
6. Lighthouse of Alexandria
 
*This list is considered the least likely. If true, this list would have come into effect with the destruction of the Temple of Artemis at Ephesus, some time between 262 AD and the mid fifth century AD.  This list would have ended later in that same century with the taking down of the Statue of Zeus at Olympia, or or sooner if the Hanging Gardens of Babylon were destroyed in this range.*

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As you can see, sometimes there were only 6 of the 7 Wonders in the Ancient World, and at least four ways to list them.  I hope you have enjoyed exploring the possibilities history can provide!

Is there anything else I can do to assist you?
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