I live in a building that has no 13th floor. And the hospital where I take a clinical course also has no 13th floor. Obviously this isn't because the buildings are short, but rather because of the common superstitious fear of the number thirteen. They go right from 12 to 14. This always struck me as rather amusing given that from a Jewish perspective 13 is actually a good number. Think Bar Mitzvah, 13 Attributes of God, 613 mitzvot and even the Rambam's 13 Principles of Faith.
Anyway, I just found out recently that in some East Asian nations the number 4 is feared. (Though, again, Judaism has a number of positive connotations for the number 4. Are there any bad numbers in Judaism?) This is because the Chinese, Japanese, and Korean words for four also sound like the word for death. So buildings in those countries tend to likewise skip floors 4, 14, 24, etc.
And then I saw this picture (from wiki) which made me laugh. It's from an elevator in a building in Shanghai, which is apparently a melting pot of the world's superstitions: