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View looking north at the area where the Temple of Artemis was located. Not much remains of this once great temple. The water in the foreground and the two (rebuilt) columns mark the spot where this temple once stood.
In the distance, the walls on the horizon mark the site of the Ayasuluk Citadel and the large building below it is the Isa Bey Mosque. Below and to the right of the large tree on the horizon, barely visible, are the remains of the St. John Basilica.
In its day, the Temple of Artemis was one of the seven wonders of the ancient world. At its height, it had 127 columns. The best way to envision this temple is to view the Apollo Temple at Didyma that is very well preserved.
Image from the Zondervan Atlas of the Bible, p. 236.