The House on the Rock is the most twisted tourist attraction I have ever visited. I loved it so much, that that's where I proposed to Heather (in the Carousel Room).
The Heritage of the Sea room features a model of a sea monster ("as long as the Statue of Liberty is tall") battling a giant squid, while a music machine plays a calliope-sounding version of "Octopus' Garden". The walls are lined with over a hundred ships models, most of which are several feet long.