The Wieliczka Salt Mine is a subterranean network of man-made tunnels up to 327 metres in depth for extracting salt, located beneath the town of Wieliczka in southern Poland.
The Dovbush Rocks is a group of natural and man-made structures, carved out of rock in the Skolivski Beskydy National Park in the Skole Raion of Ukraine.
Camlet Moat is a quadrangular moated enclosure monument known as ‘London’s Camelot’ near the summit of Ferny Hill, located in the Trent Country Park in the London Borough of Barnet.
Tintagel Castle is an archaeological site and medieval fortification located on a headland next to the modern-day village of Tintagel in Cornwall, England.
Führerhauptquartier Werwolf was the codename for a bunker complex built during WW2 as a military headquarters for Adolf Hitler and his generals to monitor the eastern front.
Londinium is the name given to the Roman city, now occupied by the City of London that contains the historic centre and the primary central business district of London.
Olous, also called Olus is an ancient Dorian city that lie on both sides of the isthmus connecting the peninsula of Spinalonga to the mainland in the modern-day town of Elounda in Crete. Researchers believe that the city was submerged due to a local shift caused by an earthquake sometime around the 2nd century AD.