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9. Classical guitar—Antonio de Torres

Sold for: $157,000

Antonio de Torres was a 19th-century Spanish guitar maker credited with creating the modern classical guitar. Most of today’s acoustic guitars are based on his original designs.

Torres had been building his instruments for 18 years before he started signing them in 1871, so an authentic creation from those earlier years is a sought-after rarity that is almost guaranteed to command a high price. This is why this guitar, which was built in 1864, sold in October 2007 for $157,000, the world auction record for this maker.

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Photo credit: Christie's