Place to see: The Exploratorium, San Francisco, California, United States

About this place:

It's like an interactive science-based art gallery housed in a (adaptive reuse) building down by Chrissy Field. Some amazing artists that work with natural phenomena have installations there including Doug Hollis and Ned Kahn. To avoid crowds, try a rainy weekday if you can swing it.

(Free on the first Wednesday of the month)