My all-time favorite ride is Phantom Manor in Disneyland Paris. It’s been my favorite since I went on it as an 8-year old girl in 1992 when the European park opened. I’ve never been to any of the US parks but by the looks of it Disneyland Park's Haunted Mansion is very similar to the French Phantom Manor.
Believe it or not but Haunted Mansion is celebrating it’s 40-year anniversary and one of my absolute favorite artists, Shag, has created a series of prints and merchandise to celebrate the event. This can’t be bought online unless you hunt it down at insane prices on eBay, so you'll have to make due with low-res pictures.