Shangdu is a remote but regularly visited UNESCO World Heritage Site. Today, only ruins remain, surrounded by a grassy mound that was once the city walls.
Once a flourishing Maya city, Palenque, located near the Usumacinta River in the Mexican state of Chiapas, was reclaimed by the jungle after its decline, around 799 CE.
Excavated and restored since being rediscovered in 1784, Pelenque is now a UNESCO World Heritage Site. However, archaeologists believe only about 10% of the total area of the city is explored.
Sited in the Pakistan province of Sindh, Mohenjo-daro (meaning "Mound of the Dead Men") was one of the largest settlements of the ancient Indus Valley civilization. It was abandoned in 1900 BCE and not rediscovered until the 1920s.
Successive excavations unearthed some notable artifacts, including "The Priest-King," a seated stone sculpture which is now on display at the National Museum, Karachi. Mohenjo-daro was designated a UNESCO World Heritage Site in 1980.
Undiscovered until the mid-19th century, the remains of the city were subsequently excavated and what you see today falls within the boundaries of the Troy Historical National Park.
In 2018, the Troy Museum opened at Tevfikiye village near the archaeological site. Around 2,000 artifacts uncovered from the area are on display. The park itself is a UNESCO World Heritage Site.