Ephesus

The Isabey Mosque or The Temple of Artemis: one of the 7 Ancient Wonders of the World.

Temple of the Virgin Mary.

The Library of Celsus (c. 114 AD).

Temple of Hadrian (117-128 AD).

The Nike Symbol (yup, that's where it comes from).

The earliest structures in Ephesus were built during the first century BC. Most of the remaining sites are from the first century AD. The city once housed a thriving population of approximately 250,000 people until a combination of invasions (mainly the goths in 262 AD) and earthquakes destroyed much of the city. However, considering the destructive factors involved, the city is still in very impressive shape. I am always amazed to see how much the dark ages set human society back. If such intricate and sound structures could be made in ancient times, how could we have had such a reversal?