If you dare enter the House of Mystery, located about 40 minutes north of the California and Oregon border, just east of I-5.
Open to the public since 1930, it may or may not be well known if you ask people you know. But people who have visited never forget the experience. It's difficult to explain exactly what goes on there, but the website gives a good idea. Basically, laws of physics are not completely followed on that land. You can see odd things in the pictures, but a visit in person would be the best way to experience the House of Mystery.