Rhodes

Similarly, what was the Colossus of Rhodes made of? Made of bronze and reinforced with iron, it was weighted with stones. The Colossus was said to be 70 cubits (105 feet [32 metres]) high and stood beside Mandrákion harbour, perhaps shielding its eyes with one hand, as a representation in a relief suggests.

Then, why is the Colossus of Rhodes considered a wonder of the world?

The Colossus of Rhodes was one of the Seven Wonders of the Ancient World. It represented the god Helios, and was built to thank the gods for the victory over Demetrius Poliorcetes long siege (305 BCE) of Rhodes. The Rhodians decided to express their pride by building a triumphal statue of their favorite god, Helios.

When was the Colossus of Rhodes built?

292 BC