Ubari
Ubari is an oasis city in southwestern Libya.
Derinkuyu
Derinkuyu Underground City is an ancient multi-level underground city in the Derinkuyu district in Nevşehir Province, Turkey. With its eleven floors extending to a depth of approximately 85 m, it was large enough to shelter tens of thousands of people together with their livestock and food stores. It is the largest excavated underground city in Turkey and is part of a network of several underground complexes found across Cappadocia.
Gamboa
Gamboa is a small town in the Republic of Panama. It was one of a handful of permanent Canal Zone townships, built to house employees of the Panama Canal and their dependents.
The tunnels of Cu Chi
The tunnels of Củ Chi are an immense network of connecting underground tunnels located in Ho Chi Minh City (Saigon), Vietnam, and are part of a much larger network of tunnels that underlie much of the country.
Portmeirion
Portmeirion is a popular tourist village in North Wales. It was designed and built by Sir Clough Williams-Ellis between 1925 and 1975 in the style of an Italian village and is now owned by a charitable trust.
Maginot Line
The Maginot Line, named after French Minister of Defense André Maginot, was a line of concrete fortifications, tank obstacles, artillery casemates, machine gun posts, and other defenses, which France constructed along its borders with Germany and Italy, in the light of experience from World War I, and in the run-up to World War II.
Metro-2
Metro-2 in Moscow, Russia is a purported secret underground metro system which parallels the public Moscow Metro. The system was built supposedly during (or from) the time of Stalin and codenamed D-6 by the KGB. The length of Metro-2 is rumored to exceed even that of the "civil" (i.e. public) Metro. It is said to connect the Kremlin with the FSB headquarters, the government airport at Vnukovo-2, and an underground town at Ramenki, in addition to other locations of national importance.
Leptis Magna
Leptis Magna was a prominent city of the Roman Empire. Its ruins are located in Al Khums, Libya, 130 km east of Tripoli.
Bagan
Bagan is home to the largest and densest concentration of Buddhist temples, pagodas, stupas and ruins in the world with many dating from the 11th and 12th centuries.
Giethoorn
Giethoorn is called the Venice of the Netherlands for about 7.5 km of canals run through the little village. Some 50 little wooden bridges span the canals. It was founded around 1230 when fugitives coming from the Mediterranian regions settled there.