The Wonders is purely imaginative. It doesn't draw from any actual happenings. The story and characters are crafted from the author's imagination to entertain and engage the audience.
The Colosseum in Rome is quite famous. It was used for gladiatorial contests and public spectacles in ancient Rome. Its grandeur and the historical events that took place there make it a wonder based on true history.
The Great Wall of China is one. It was built over a long period of time for defense purposes. There are historical records and archaeological evidence to prove its existence and construction process.
Well, without having read it specifically, generally in a true story there could be real people, real events, and real emotions. It might have elements like the main characters' struggles, their achievements, and the historical or social context in which the story unfolds.
Maybe the main theme is inspiration. If it's about true stories of wonders, it might be aiming to inspire readers or viewers with tales of remarkable things that have happened or been discovered.