This week I was dealing with a very 'peaky' dataset where the peak was close to the axis. Imagine something starting like this but with thousands of rows following:
The default bar chart in tableau was hiding the very first mark, which is the big peak, under the axis. Only the axis range going up to a much higher numbers than the visible bars was hinting at the hidden peak.
The mark was there and was becoming visible if I selected it. Selection in tableau by default adds a border, which suggested a solution to make the peak visible: