Cleopatra’s Alexandria Amazing Underwater Cities. *Atlantis* ~An island country mentioned within an allegory on the hubris of nations in Plato's works Timaeus and Critias, where it represents the antagonist naval power that besieges "Ancient Athens
Santa Marta, Colombia -- La Ciudad Perdida (The Lost City). Hidden (literally) in the crevices of northern Colombia’s Santa Marta Sierra Nevada mountain range, La Ciudad Perdida was built by the Tayrona people around 800 AD.
The lost city of Petra, remains of an ancient, rich civilization that was the centerpiece of 'Indiana Jones and the Last Crusade' is clearly a destination to be explored at least once in this lifetime!