Ancient Wisdom or Alien Technology?

Take a look at these artifacts. What do you think they resemble?

First of all you might believe them to be animals, birds or even insects. Take a closer look. Birds don't have upright tail feathers do they? Insects don't have wings located on the underside of their bodies either.

My first reaction was that they look like toy spaceships similar to the space shuttle

Huge similarities between the two, I'm sure you have to agree.

Now the only problem is, the artifacts at the top were actually made in gold at least 1000 years ago. The even more shocking reality is that they have been found around the globe. Ranging from South America to India. Cultures 500 years ago struggled to navigate the globe easily, let alone merge and share cultures over 1000 years ago.

Furthermore, scientists have made scale replicas of the artifacts and attached engines/propellers and they actually fly perfectly. How can  so called primitive cultures produce aerodynamically sound objects such as these? Unless they had the knowledge of flight, I deem it quite impossible.

Food for thought I guess!