While millions of baseball cards are tucked away in attics, basements, and storage units across the country, many people don’t realize just how valuable some of those old cards may be. Whether it’s a rare rookie card of a future Hall of Famer or a unique error card, certain baseball cards from the past can be worth thousands, tens of thousands, or even hundreds of thousands of dollars depending on condition and demand. Here are 88 baseball cards worth keeping an eye out for as you dig through your or a relative’s old collection.

Honus Wagner – T206 – The crown jewel of the hobby, Honus Wagner’s iconic 1909-11 T206 card is the most valuable trading card in existence. In near-mint condition, examples have sold for over $3 million. Even in poor condition a Wagner T206 can fetch six figures.

Babe Ruth – 1914 Baltimore News – Babe Ruth’s earliest known card is exceedingly rare with only about 50-100 known to exist. High grade examples have sold for around $500,000.

Mickey Mantle – 1952 Topps – The Commerce Okla Comet’s rookie card is arguably the most desirable in the post-war era. PSA Gem Mint 10 copies have reached $2.88 million at auction.

Shoeless Joe Jackson – 1911 M101-3 Old Mill – One of the rarest pre-war cards, the Shoeless Joe is iconic for his role in the Black Sox Scandal. Lower grade examples still sell for five figures.

Honus Wagner – 1909-11 American Caramel – A key early issue card similar to the T206 set. High grade specimens with the elusive “swine” back variety can net six figures.

Ty Cobb – 1911 Triangle Cigarettes – A rare early Cobb issue showing him with the Detroit Tigers. Even well-worn copies in the $10,000 range are attainable depending on condition.

Nolan Ryan – 1966 Topps – The Express’ first card captures him as a teen with the Mets. Pristine examples eclipse the $30,000 mark.

Mike Trout – 2009 Bowman Chrome Draft – Trout’s premiere rookie refractor parallel /50 is the pinnacle Angels PC card worth north of $100,000.

Sandy Koufax – 1955 Topps – The lefty’s sole rookie card is a must-have for Dodger collectors. High-end copies approach five figures.

Roberto Clemente – 1955 Topps – The Hall of Famer’s sole rookie card remains a Pittsburgh staple. Near-mint copies sell for $4,000+.

Willie Mays – 1951 Bowman – The Say Hey Kid’s colorful debut is iconic. High-grade versions consistently net five figures or more.

Mickey Mantle – 1953 Topps – The Commerce Comet’s sophomore card captures him in Yankee pinstripes. Pristine copies sell for $10,000+.

Joe DiMaggio – 1937 Play Ball – A key early DiMaggio, showing him with the Seals before joining the Yankees. Even well-worn copies sell for $5,000+.

Ken Griffey Jr. – 1989 Bowman – The first Junior card is iconic for Mariners fans. Pristine copies eclipse the $10,000 threshold.

Roberto Alomar – 1988 Donruss – Alomar’s rookie debut is iconic for Blue Jays collectors. Near-mint copies sell for $2,000+.

Derek Jeter – 1992 Bowman – Capturing the future Captain as an 18-year-old prospect. High-end PSA 10 Gems reach $20,000+.

Sandy Koufax – 1961 Topps – Koufax’s lone MVP card highlights his dominant 1961 season. Top-rated versions sell for $4,000+.

Chipper Jones – 1993 Bowman – Jones’ rookie card as the top Braves prospect. Highly-graded copies sell for $2,000+.

Cal Ripken Jr. – 1981 Topps – Ripken’s rookie debut as an Oriole. Near-mint copies sell for $1,000.

Barry Bonds – 1985 Topps – Bonds’ Pirates rookie card before his steroid era. High grades fetch $1,000+.

Frank Thomas – 1989 Bowman – The Big Hurt’s rookie card as the top White Sox prospect. Pristine Gems reach $2,000.

George Brett – 1973 Topps – Brett’s early Royals card before his hitting prowess. Near-mint copies sell for $700.

Nolan Ryan – 1968 Topps – Ryan’s Angels card highlighting his 100+ mph heat. Pristine copies sell for $1,000.

Tom Seaver – 1967 Topps – Seaver’s Mets rookie is a must-have for any collection. Near-mint copies sell for $800.

Roberto Clemente – 1964 Topps – Clemente’s action pose captures his grace. Pristine versions reach $1,500.

Reggie Jackson – 1968 Topps – Reggie’s A’s rookie before “Mr. October.” Near-mint copies sell for $600.

Willie McCovey – 1959 Topps – The Giants slugger’s rookie debut. Near-mint versions sell for $500.

Johnny Bench – 1968 Topps – Bench’s iconic Reds rookie card as a 21-year old catcher. Near-mint copies sell for $600.

Ozzie Smith – 1978 Topps – The Wizard’s Padres rookie card. Pristine Gems reach $1,000.

Ernie Banks – 1953 Topps – Mr. Cub’s sole rookie card. Well-kept copies sell for $400.

Harmon Killebrew – 1954 Topps – The Killer’s early Twins card. Near-mint copies sell for $300.

Roberto Alomar – 1990 Topps – Alomar’s star-studded Blue Jays card. Pristine Gems reach $800.

Dwight Gooden – 1984 Topps – Dr. K’s iconic Mets rookie. Near-mint copies sell for $400.

Kirby Puckett – 1984 Topps – Puckett’s early Twins card. Pristine Gems reach $500.

Jackie Robinson – 1947 Leaf – One of Robinson’s earliest cards from his rookie season. Even well-worn copies sell for $300.

Ted Williams – 1939 Play Ball – One of the Splinter’s earliest issues before his military service. Well-kept copies sell for $250.

Don Mattingly – 1981 Topps Traded – Mattingly’s scarce traded rookie card. Pristine Gems reach $800.

Roberto Clemente – 1960 Topps – An action shot of Clemente. Near-mint copies sell for $300.

Nolan Ryan – 1971 Topps – Ryan’s early Angels card highlighting his 100+ heat. Near-mint copies sell for $200.

Jim Palmer – 1965 Topps – Palmer’s Orioles rookie before his Cy Young seasons. Near-mint copies sell for $150.

Willie Stargell – 1963 Topps – Stargell’s early Pirates card. Near-mint copies sell for $150.

Reggie Jackson – 1971 Topps – Reggie’s early A’s card before “Mr. October.” Near-mint copies sell for $150.

Duke Snider – 1953 Topps – Snider’s Dodgers card from his MVP season. Near-mint copies sell for $150.

Bob Gibson – 1959 Topps – Gibson’s early Cardinals card. Near-mint copies sell for $100.

Carl Yastrzemski – 1961 Topps – Yaz’s breakout Red Sox card. Near-mint copies sell for $100.

Steve Carlton – 1965 Topps – Lefty’s Phillies rookie card. Near-mint copies sell for $100.

Nolan Ryan – 1972 Topps – Another iconic early Angels Ryan. Near-mint copies sell for $75.

Don Drysdale – 1956 Topps – Drysdale’s early Dodgers card. Near-mint copies sell for $75.

Hank Aaron – 1954 Topps – Hammerin’ Hank’s Braves card. Near-mint copies sell for $75.

Jackie Robinson – 1952 Topps – One of Robinson’s post-rookie issues. Near-mint copies sell for $75.

Roberto Clemente – 1961 Topps – Clemente’s action pose for the Bucs. Near-mint copies sell for $75.

Rollie Fingers – 1968 Topps – Fingers’ A’s rookie card. Near-mint copies sell for $75.

Al Kaline – 1955 Topps – Mr. Tiger’s sophomore Tigers card. Near-mint copies sell for $75.

Frank Robinson – 1956 Topps – The first Frank Robinson card. Near-mint copies sell for $50.

Carl Yastrzemski – 1964 Topps – Yaz’s breakout ’63 season for Boston. Near-mint copies sell for $50.

Tom Seaver – 1970 Topps – Seaver during his early Mets dominance. Near-mint copies sell for $50.

Mike Schmidt – 1974 Topps – Schmidt’s early Phillies card. Near-mint copies sell for $50.

Nolan Ryan – 1973 Topps – Another iconic early Ryan Angels issue. Near-mint copies sell for $50.

Rod Carew – 1969 Topps