Ancient stories and mythology has defined numerous of cities with great features, but currently these cities don't exist and reason for their invisibility is still a mystery.
Ubar
City was famous for its wealth and prosperity. People believe it was located in Empty Quarter of Arabian Peninsula. The exact location and reason for disappearance is still a mystery.
Akakor
City of god, hidden in Amazon Rainforest. City was a symbol ancient civilization with great technologies and knowledge. There is no evidence available that proves the existence of city.
Was constructed around 1200 CE in Pohnpei, city contain around 100s of artificial island connected by causeways, decorated with stone structures. Purpose of its construction is a mystery.
Yonaguni
City was situated near coast of Japan, site contains stonework, terraces, and pyramid like structures. City was created by ancient people or it formed naturally, its origin is still a question.
Vinland
Archeologist suggest, city was created by Norse people temporarily in Newfoundland, Canada. The exact location and reason of disappearance of city is still unclear.