You might be scratching your head at this one, wondering why something as common as sliced bread is worth so much money. LEGO is still a massively successful company and still the bane of most parents' lives (have you ever stepped on a piece of LEGO by accident? It's a unique category of pain!). New versions of LEGO are still being manufactured all the time. They even have LEGO films now. But if you're the proud owner of some more seasoned LEGO sets, you could be in the money.
If you have the Eiffel Tower set, why not try selling it for $1,800? The Statue of Liberty is worth even more at around $2,000. Another popular landmark is the Taj Mahal, which has been known to sell for at least $2,700. The most valuable is the Ultimate Collector's Millennium Falcon at $4,000.