Tikal was an important city in the Maya civilization's golden period, which occurred around the sixth century AD. It was concealed in the bush and inexplicably abandoned in the tenth century before being rediscovered in the nineteenth.
An ancient Incan castle in Peru's Andes Mountains, thought to have been erected in the 15th century and abandoned during the Spanish conquest, was uncovered in 1911.
A historical city carved into Jordan's sandstone cliffs, thought to have been founded by the Nabataeans as early as 312 BC and later abandoned, with outstanding architecture and rock-cut constructions.
An ancient city in modern-day Turkey, made famous by Homer's epic poem, the Iliad, and the legendary Trojan War, is thought to have been destroyed about 1184 BC and forgotten for decades before being unearthed by researchers.
An ancient Mayan city in Mexico's jungles that is thought to have been inhabited between 226 BC and 799 AD. It is notable for its spectacular architecture, which includes the Temple of the Inscriptions and the Palace.
A historic cliff dwellings site in Colorado, USA, founded by the ancestral Puebloans approximately 600 AD and abandoned in the late 13th century, is noted for its well-preserved adobe houses.
The Khmer Empire developed a historic city complex in Cambodia between the 9th and 15th centuries, which is noted for its beautiful temples, especially Angkor Wat, and complicated water management systems.