Crowds of people frantically try to take a good picture of the Mona Lisa, which is stupid. 90% of them use flash, and the Mona Lisa is protected by this glass case… so their picture ends up being the reflections on the glass. Buy a poster instead.
It’s also extremely hard to even look at.. especially when everyone is pushing you.

=( I wish everyone who visited the Mona Lisa would just put away their flashy cameras to take the time to actually look at the painting itself! But alas! That’s not the case!