Ryugyong Hotel in Pyongyang, North Korea, is one of the tallest unoccupied buildings in the world. Construction on the "Hotel of Doom" began in 1987 and has stopped and started several times.

Several centuries ago, if you wanted to cross the Grand Canal, the Rialto Bridge was the only way. There are now four major bridges that cross the canal, but Rialto is by far the most famous.