1: Rare bicentennial quarter sells for nearly $20 million at auction.

2: 5 more bicentennial quarters worth over $800,000 each.

3: Collectors scramble to find rare bicentennial quarters.

4: History and value of the bicentennial quarter.

5: Tips for identifying valuable bicentennial quarters.

6: Investing in rare coins: bicentennial quarters to watch.

7: How to preserve and display rare bicentennial quarters.

8: Finding reputable dealers for rare coin purchases.

9: The allure of rare coins: bicentennial quarters as a collector's item.