Only 10% of the world's population knows the secret behind the famous wonders of the world.

On Earth there are many mysterious works that scientists are still headache to find an explanation for the question: Who designed it? Why does it have these characteristics?

• Who designed the leaning tower of Pisa - Italy?

The Leaning Tower of Pisa is an art form that has not been identified by anyone. It was built in three phases, with a total length of 174 years, with many designers completing the tower. This is a must. However, there is still no consensus on the first architect to paint the entire design of the tower of Pisa.

Experts still argue with each other, someone named Bonanno Pisano - a famous bronze foundry who cast the entrance to Cathedral Cathedral. He collaborated with Guglielmo in Innsbruck to design towers. This hypothesis was later rejected, but the merit was transferred to Diotisalvi, one of the greatest architects of the 12th century, who was supposed to be the father of the Baptistery.

• The shackles at the foot of the Statue of Liberty - United States:

The Statue of Liberty is a gift to the American people on the occasion of the 100th anniversary of the United States signing the Declaration of Independence in 1886. For more than 132 years, the statue is considered a symbol of freedom. , democracy and the abolition of slavery in the United States. That is why the broken chain appears at the foot of the statue.

However, many visitors to this site often do not pay attention to this highlight.

• Secret Room on the Eiffel Tower - France:

Gustave Eiffel - the "father" of great architecture in Paris, after building the Eiffel Tower, he has built a secret room on the top of the tower. The apartment was rather modest with no luxurious amenities, but there were tapestries, wall papers, cabinets, a bedroom and a small laboratory that housed high-tech scientific equipment at the time.

Many tourists are willing to pay only to visit Gustave Eiffel's air home - where he welcomes his distinguished guests, genius Thomas Edison

• Real name of "Big Ben" tower - England:

It is true that the name Big Ben was not used to refer to the tower in the Parliament House, but that it was just the name of the big bell in it. Until September 2012, this building was officially called "Westminster Castle Bell Tower" and is now being renamed "Elizabethan Tower."

At present, no one dares to say exactly where the name Big Ben comes from. It is assumed that Big Ben is the nickname of the worker responsible for casting the bell. While, another theory suggests that the big bell was named after the heavyweight boxing champion Benjamin Count.

• The true look of the Sphinx - Egypt:

The Sphinx of Giza is the oldest statue in the world. Unlike what we see in the present statue, the Sphinx is decorated with bright colors and has a full nose and beard.

These two pieces are still kept in museums in England and Egypt. Some experts believe that the original Sphinx only had a lion face, and a long face was engraved. This explains why there is a large difference in the ratio of the giant body to the smaller head of this world wonder.

The more "mysterious" the buildings are, the more unknowingly the discovery of the secrets behind it is always enjoyable, as well as providing us with the necessary knowledge to identify a new problem.