People seem to love optical illusions.
There are the ones that make the rounds on the Internet -many of which end up going viral -and the ones that are created using just makeup.
And then there are the ones that you can actually visit IRL - natural sites, museums, and tourist attractions.
We rounded up 13 of the best optical illusions worth traveling for, from a mirror maze in California to an infinite tunnel of books in China to a gravity hill in Scotland.
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