foundation is likely to be from the original construction of the town in the 13th century AD. above historic al-Ula, the town's Castle commands strategic views over the entire valley. It is sometimes referred to as the Castle of Musa bin Nusayr, the Umayyad-era army general who ruled over North Africa and was involved in conquering Andalusia in the early 8th century AD. He is said to have died in this castle on his way from Damascus to a pilgrimage in Mecca in 715 AD. Although the castle was rebuilt more than once during its long history, its origins date back to the 6th century BC. In fact, some of the foundation stones are from the original 2,600-year-old construction (according to signs posted). The castle is currently more of a bastion or watchtower once used to protect the town. Albaten Tharmida Singapore A few blocks of HDB flats (apartment flats) located in the Lim Chu Kang area of the island is known to be the only ghost town in Singapore. Named the Neo Tiew Estate (or officially the Lim Chu Kang Rural Centre), it used to house residents before they were moved out of the vicinity in 2002 as part of an En-bloc scheme. Since then the Singapore government has declared it state land and nothing was done to demolish or renovate the flats. The area was used by the Singapore Army as a training facility from 2005–2009 until a newer training facility was built nearby in 2008. The facility was used most recently in 2012 when it was used to shoot scenes for the film Ah Boys to Men. As of today, its fate remains unknown. Syria The city of Quneitra became a ghost town after the 1967 Six-Day War and subsequent Yom Kippur War in 1973. The ruins were left in place, and a museum has been built to memorialize the destruction. Billboards are maintained at the ruins of many buildings and the town is effectively preserved in the condition that the wars left it in. Taiwan The Sanzhi UFO houses in Taiwan were a set of abandoned pod-shaped buildings built in New Taipei City as a vacation resort. They stood abandoned for thirty years before being demolished in 2010. Thailand The city of Old Ayutthaya was the capital of the country from its foundation in 1350 until it was sacked and destroyed by the Burmese in 1767.