Perhaps you have heard someone says ‘El Eldorado’, here the version and context is different. El Dorado is among the most famous mysteries in the world.
The name El Dorado was given to an Indian chief, in South American regions in the early 15th century. The Indian chief had the same attributes like a Mayan priest, but something special about him was gold. As you know, Indians in ancient eras took gold as sacred, and often associated it to Gods. If you had gold with you, you were considered as a servant of Gods, or an important person.
Based on this legend, it is said that the chief had a large amount of gold, jewels and others in a ritual ceremony. After the ritual, the chief dropped all the gold stuffs in a lake, Guatavita. After some decades, the Spanish had heard about that story of gold, and they planned to search them. Unfortunately, neither they found the chief nor the gold, even they did find the lake.
Other treasure hunters went to the lake to find the gold but in vain. The Spanish in that era did try to make the lake dry, and they failed. We are still trying to find if this story is real or not, it may be a legend, but it can be real as well.