Nynäshamn S, Sweden
The Landsort Artillery Battery
A southern Swedish island is home to the last ERSTA artillery battery, meant to protect the shoreline during the Cold War.
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Nynäshamn S, Sweden
A southern Swedish island is home to the last ERSTA artillery battery, meant to protect the shoreline during the Cold War.
Caesarea, Israel
Built by a king and rebuilt by an emperor, this aqueduct transported water for 1,200 years to this ancient Mediterranean hub.
Rome, Italy
A magnificent waterfall is also home to the remains of a Roman hydraulic engineering system.
Guarcino, Italy
This mysterious ancient arch is hidden in the forest of Simbruini Mountains Regional Park.
Alba, Italy
Ever loyal to Roma, the small village of Albe in the Abruzzo region carried on until an earthquake did it in.
Avezzano, Italy
This Roman underground canal was the longest tunnel ever built until the late 19th-century.
Paestum, Italy
The only visible remains of this ancient Greek underground temple is its roof protruding from the earth.
Newcastle upon Tyne, England
This Roman archeological site is hidden amid a 1930s housing estate.
Gloucestershire, England
Home to the ancient Roman temple of a lesser-known Celtic god that inspired J. R. R. Tolkien and H. P. Lovecraft.
Stockholm, Sweden
This railroad track was so secretive that it was omitted from all maps.
Fujairah, United Arab Emirates
The United Arab Emirates's biggest and oldest fort pays homage to a lost era.
Lille, France
This triumphal arch celebrating the Sun King's conquest of Lille is a masterpiece of military architecture.
Istanbul, Turkey
A section of the long chain that blocked enemy ships from entering Constantinople.
Rome, Italy
Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.
Rome, Italy
This ancient Roman arch misled treasure hunters for centuries.
Rome, Italy
This one-of-a-kind Roman arch is not actually dedicated to the god Janus.
Rome, Italy
In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.
Madrid, Spain
A subterranean relic of the Spanish Civil War hides below this picturesque park.
Schwäbisch Gmünd, Germany
These abandoned Cold War-era bunkers are now a designated refuge for endangered bat species.
Virolahti, Finland
Fortifications built for a Soviet invasion that never came now sit abandoned in a losing battle against nature.
Xian Shi, China
Although resembling a grand Buddhist temple, this structure is actually the largest mosque in China.
Rome, Italy
A rare example of a medieval house in Rome adorned with a melancholic inscription.
Rome, Italy
This ancient market is often referred to as the oldest shopping mall in the world.
Rieti, Italy
This ancient Roman bridge was a key feature of the ancient Via Salaria road.