1: Rare bicentennial quarter sells for nearly $13 million at auction.

2: Three more valuable bicentennial quarters worth over $20 million each.

3: Collector's frenzy over rare bicentennial quarter prices skyrocketing.

4: Insider tips for finding valuable bicentennial quarters in circulation.

5: History and significance of the bicentennial quarter.

6: How to authenticate and preserve rare bicentennial quarters.

7: Top 5 most valuable bicentennial quarters of all time.

8: Investment potential of rare bicentennial quarters.

9: Where to buy, sell, and trade valuable bicentennial quarters.