Trump Taj Mahal, Atlantic City: $2.3 billion (ยฃ1.7bn)
Once described by Donald Trump as โthe eighth wonder of the worldโ, the Taj Mahal hotel and casino in Atlantic City cost $1.2 billion (ยฃ930m) to build in 1990. The blingy 120,000 square foot complex eventually became unprofitable and shut for good in October 2016, but has since reopened as the Hard Rock Hotel & Casino.