"Tower Without Ends" - Credit: Wikimedia Commons
The Tour Sans Fins (“Endless Tower”) was a tower planned in La Défense that has since been cancelled. The spelling Tour Sans Fins may, to a native French-speaker, sound like a grammatical mistake as it would normally be written Tour Sans Fin without the ‘s’ at the end of fins. However, the idea was that this tower had no ends, even if one looked up or down at it, hence “ends” and not “end”. Read more on Wikipedia
Source: en.wikipedia.org