This was the site of the UK's AWRE in the '50s and '60s before moving to Aldermaston - as well as the site of a good many other military research and development projects. A good write up of the history can be found here.

This one is cheating a bit. This abandoned water park in Thuy Thien Lake has fallen into disuse but had found it's second life as a tourist attraction. While the project has been abandoned, on any given day you'll find a number of tourists wandering the premises in their rental scooters taking pictures.

Interestingly, the former aquarium held three crocodiles that were only recently remove from the premise.

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More information can be found here: https://www.expatolife.com/thuy-tien-lake-abandoned-water-park-hue-vietnam/

After becoming too expensive to maintain, Miranda Castle was abandoned in 1991. A fire in 1995 destroyed part of the roof, and dry rot has set into the wood. The building is still owned by Liedekerke-Beaufort family, who, following the fire, stripped the castle of its more valuable components.

Fort Ord was a U.S. Army post on Monterey Bay in California. It was established in 1917 as a maneuver area and field artillery target range and was closed in 1994. Most of the fort's land now makes up the Fort Ord National Monument, managed by the United States Bureau of Land Management.

However, a portion of the fort is still abandoned and off-limits to the public due to the presence of unexploded ordnance and asbestos within the buildings. This restricted area includes dilapidated barracks, crumbling mess halls, and the old military hospital, which stands as a relic of the past.

Urban legends and stories from locals and former soldiers have painted a picture of Fort Ord as a haunting ground. People claim to have heard strange noises, voices whispering their names, and footsteps in the empty buildings.

Houtouwan—a former fishing village located about 87 miles southeast of Shanghai on Shengshan Island—has been uninhabited for several decades, but this is not your average ghost town. Instead of being covered in dust and rubble, these buildings are almost entirely occupied by creeping ivy and lush vegetation, creating a green landscape that is more spectacular than devastating. While most of the village’s original residents moved inland in the early 1990s, a few people do still live on the island, selling water to curious tourists and photographers.

Hashima Island was once a bustling coal mining facility owned by Mitsubishi. From the late 19th century to the mid 20th century, the island was populated with thousands of workers and was equipped with apartment buildings, a school, and other necessary facilities to accommodate them. At its peak in 1959, the island was one of the most densely populated places on earth with over 5,000 inhabitants.