Most pirates had two eyes in perfect condition, but kept an eye patch on one of them to keep it adjusted to darkness, facilitating night navigation and the passage from the upper deck (in daylight) to lower bridges (very dark).
Read the DYK
The Eiffel Tower should have been dismantled after the Universal Exposition of 1889 for which it had been built; the Eiffel Tower has especially been saved by telegraphy.
Indeed, the Eiffel Tower was used as an antenna during World War One and as an experimental laboratory for electromagnetic waves.
Sources:
Universal Exposition on Wikipedia
Eiffel Tower on Wikipedia
