Mike 
am 16.05.12, 23:26:34
Yeah, I just recently met Sehenswfcrdigkeit, in the same book actlaluy. I thought it was an interesting one. Denkmal might be made up of denken (think), and the noun, not the time adverb / participle. Das Mal can mean brand, mark, sign, or memorial, monument. However, I'm not really sure whether das Mal stemmed from the adverb / participle mal. It'd be cool if it did, because then your Think about it for once! description would still hold.
