7. Newport Tower Rhode Island The accepted explanation of its origin is that it was a mill built in the mid 17th century. However, some historians, as well as amateur researchers, have claimed that it is several centuries older, thus being evidence of a pre-Columbian settlement in New England.
16. North Korea Contractor -Baekdu Mountain Architects & Engineers, Balfour Beatty Construction -1987 The Ryugyong Hotel is a concrete skyscraper that is under construction. It is intended for use as a hotel in Sojang-dong, in the Potong-gang District of Pyongyang, North Korea. The hotel's name comes from one of the historic names for Pyongyang: Ryugyong, or "capital of willows." Its 105 stories rise to a height of 330 m (1,083 ft), and it contains 360,000 m² (3.9 million square feet) of floor space, making it the most prominent feature of the city’s skyline and by far the largest structure in the country. Construction started in 1987 and ceased in 1992 due to a combination of poor-quality construction and financial difficulties.
