Flying has become much safer after Tenerife air disaster
The worst air disaster ever occurred on the runway of the airport on the Canary Island of Tenerife. Two Boeings collided there at full speed. One Boeing did not have take-off clearance yet, but other circumstances also played a role. It was very foggy and there was confused communication with the control tower. Since then, flying has become much safer. Airline staff are allowed to make mistakes and admit them, so that everyone can learn from them.
The leaning tower of Pisa
When the construction of the tower of Pisa began in 1173, not everything went smoothly. The tower began to lean more and more. The project was halted several times and the new floors were built straight, making the tower not only leaning, but also crooked. The leaning makes the tower very unique and therefore the tower has been a tourist attraction for years, bringing in a lot of money.