Vallone dei Mullini

The haunting buildings of the Vallone dei Mullini, or Valley of the Mill, in Sorrento, Italy were only abandoned in the 20th century, according to Atlas Obscura.

Stelling van Amsterdam

The Stelling van Amsterdam was the most advanced military structure of its type in the world – 135 km (84 miles) of forts, batteries and moats completely encircling the city in a defensive barrier.

Great Barrier Reef

The Great Barrier Reef is the world’s largest coral reef system composed of over 2,900 individual reefs and 900 islands stretching for over 2,300 kilometres.

Maunsell Forts

The Maunsell Forts were small fortified towers built in the Thames and Mersey estuaries during the Second World War to help defend the United Kingdom.

Mar Sem Fim

Mar Sem Fim (“Endless Sea” in English) is a Brazilian yacht that was shipwrecked, sunk and subsequently got frozen in ice in Maxwell Bay of Ardley Cove, Antarctica.

The Petra Treasury

Al-Khazneh is one of the most elaborate temples in the ancient Arab Nabatean Kingdom city of Petra. As with most of the other buildings in this ancient town, including the Monastery (Arabic: Ad Deir), this structure was carved out of a sandstone rock face. The structure is believed to have been the mausoleum of the…

Río de la Plata

On the southeast coast of South America, between Uruguay and Argentina, there is a tapering intrusion of the Atlantic Ocean. The funnel-shaped intrusion extends about 290 kilometer inland and terminates at the point where the Uruguay and the Paraná rivers meet. This is Río de la Plata, or the “River of Silver” in Spanish.

The Dolerite Columns

The coastline of the southern Tasmania, in Australia, is composed of stunning rock columns that protrude up to 300 meters from the sea level. These rocks are what geologists call dolerites, with its distinct elongated shape and hexagonal columns.

Suakin Island

The island town of Suakin, in north-eastern Sudan, was an important port for trade and culture on the East African coast for centuries.

Ilha da Queimada Grande (Snake Island)

Snake Island is one of the deadliest and most restricted places on earth. The island lies off the coats of Brazil and is home to at least 4000 species of the world’s most venomous snakes alleged to possess the ability of melting human flesh. The island is banned to tourists and is only open to scientists for study and research.

Stone Forest

The Stone Forest or Shilin is a notable set of limestone formations about 500 km2 located in Shilin Yi Autonomous County, Yunnan Province, People’s Republic of China, near Shilin approximately 90 km (56 mi) from the provincial capital Kunming.

Preikestolen

Preikestolen or Prekestolen (English: Preacher’s Pulpit or Pulpit Rock) is a famous tourist attraction in the municipality of Forsand in Rogaland county, Norway. Preikestolen is a steep cliff which rises 604 metres (1,982 ft) above the Lysefjorden. Atop the cliff, there is an almost flat top of approximately 25 by 25 metres (82 ft ×…

Vozrozhdeniya Island

In 1948, a top-secret biological weapons laboratory, nicknamed Aralsk-7, was established here. Until its closure in the 1990s, the laboratory tested some of the deadliest pathogens known to man, including plague, anthrax, smallpox, brucellosis, tularemia, botulinum and Venezuelan equine encephalitis.

Equihen Plage

Equihen Plage, on the coast of northern France by the English Channel, is a small seaside village with a population of about 3,000.

The Kauri Driving Dams

Some 3,000 driving dams once existed throughout New Zealand, with the last built during the late 1930s. As the timber industry dwindled, gradually the dams decayed and disappeared and now only a few remain as relics of this destructive industry.