Temple of Artemis

When - 550BC - but do note that it was reconstructed many times, the first structure was once built in the bronze age, but the latest reconstruction in around 320BC was its largest, this remained for around 600 years, so for arguements sake i conclude this to be the real time of construction of the 'Wondrous' Temple.
Where - Epheses (Ancient) Turkey (Modern)
Who - Ephesians - 320 BC
Why - For the goddess Artemis