For more than 170 years, no one has dared to steal the sword hanging under this ancient bridge. What is the reason?
An ancient submerged bridge has been discovered in a mysterious cave on the Spanish island of Mallorca.
Tucked away in a national forest, the natural stone bridge, dating from the dinosaurs, is estimated to be around 200 million years old.
The low water level when the dry season comes makes the stone bridge with 400 years of age suddenly appear.
The old bridge in Turkey disappeared for unknown reasons and left no trace, sparking much speculation from the villagers.
An Binh Bridge is built from large blocks of stone, over 2 km long, located in the west of Fuzhou City, China.
National Geographic (NatGeo) is a scientific information channel about mysterious expeditions and endless journeys to discover the world of leading scientists.