The Guyaju Caves, also known as the Yanqing Ancient Cliff House, is a rock-cut complex of honeycomb caves carved into the slopes of the Tianhuang Mountain in the Yanging District of China.
Vanis Kvabebi (also called the Vani Caves) is an ancient cave monastery, located in the Vardzia Historical-Architectural Museum-Reserve in the Samtskhe-Javakheti region of the Lesser Caucasus in present-day Georgia.
Ayaz-Kala is a complex archaeological site, consisting of three phases of fort construction located on the edge of the Kyzylkum Desert in Karakalpakstan, Uzbekistan.
The Paris Catacombs is a subterranean complex of around 200 miles of tunnels, housing the remains of millions of interred Parisians, in the former Tombe-Issoire quarries under the plain of Montrouge in Paris, France.
Dunwich, located in Suffolk, England, was an important port and trading centre, until storms and coastal erosion engulfed the town, making it now the largest underwater medieval site in Europe.
The Sedeinga Pyramids is a concentration of 80 small pyramids, constructed between the second and third cataracts on the west bank of the Nile Valley in Middle Nubia, near Sedeinga, Sudan.
Waqrapukara, loosely translated as the “horn fortress” in Quechua is a pre-Inca and Inca site, located in the district of Pomacanchi, in the department of Cusco, Peru.
In the North-West Caucasus, from Abkhazia to the Taman Peninsula, are thousands of ancient dolmens which the locals call “ispun”, meaning the “houses of dwarves”.
Los Guachimontones was a ceremonial centre attributed to the Teuchitlán Culture, located near the present-day town of Teuchitlán in the state of Jalisco, Mexico.
Bet Guvrin-Maresha is an archaeological park, that encompasses the ancient sites of Maresha, Bet Guvrin (also called Eleutheropolis and Beth Gabra), and a crusader fortress, located in the heart of the Judean lowlands of central Israel.
Choquequilla, also called Ñaupa Iglesia, is an Inca huaca shrine, constructed within a cave opening near the present-day village of Pachar in the Sacred Valley of Peru.
The Lore Lindu Megaliths are a series of carved stone monuments centred on the Bada Valley within the Lore Lindu National Park, located on the Indonesian island of Sulawesi.
The Eleusis ploutonion is a sacred sanctuary in the ancient Greco-Roman city of Eleusis, located in the Thriasian Plain in the West Attica Regional unit of Greece.
The Cave of the Sibyl is a subterranean complex beneath the ancient city of Cumae, located on the outskirts of the present-day Metropolitan City of Naples in Campania, Italy.