The Taj Mahal took 20 years and 20 thousand men to finish!
83
A monk had once written over a book that contained information about calculus that was written by Archimedes in ancient Greece that could have made us 100 or even 1000 years more mathematically and technologically advanced.
13
The site where the Parthenon was built had to be cleared of hundreds of dinosaur bones (then called giants' bones) before construction could begin.
13
Traces of cocaine were found on 99% of UK bank notes in a survey in London in 2000.
142
The oldest glowing lightbulb was first switched on in 1901 and lives in fire stations in Livermore, CA. It is known as the Centennial Light.
118
No one knows who designed the first American Flag.
45
High Heels were originally made for men in the 16th century.
78
There are pictures of Knights fighting Snails in old Medieval manuscripts - and nobody knows why.
23