Yesterday I took a trip to the John Lennon Museum in Saitama Shin-toshin. They had some cool stuff, costumes, clothes, original notes for a few songs (including a hotel napkin with the lyrics to Imagine). Since the museum was founded with with permission from Yoko Ono, there are plenty of mentions of her in various captions as well.
Travel (Summer 2009) by Zach Margolis
John Lennon Museum