Part 1 of 3. Season 18 opens in Boise, Idaho. Items include a first edition of the Book of Mormon; a 1955 Madoura plate designed by Picasso; and an 1858 oil painting by Hudson River artist Sanford Robinson Gifford that's valued at $300,000.

Part 2 of 3 in Boise, Idaho, features a mid-century pinup painting by Earl Moran; a set of "The Day the Earth Stood Still" lobby cards; and an a 1922 Edward Hopper etching titled "The Cat Boat" that's valued at $250,000. Also: law-enforcement collectibles are discussed during a visit to the Old Idaho State Penitentiary.

Conclusion. In Boise, Idaho, items include an 1822 letter from Thomas Jefferson; a Babe Ruth Candy Club membership card; and a ruby-and-diamond necklace. Also: the work of artist James Castle is discussed during a visit to the Boise Art Museum.

Part 1 of 3 in Detroit features a signed 1970 Andy Warhol poster; an early 20th-century collection of Pewabic pottery; and a working script of "The Wizard of Oz" used on set by Bert Lahr, who played the Cowardly Lion. Also: the Motown Museum is visited.

Part 2 of 3 in Motor City features Marvin Gaye's 1964 passport, which was found inside an album bought for 50 cents at an estate sale; a Petrus van Schendel oil painting, ca. 1860; and a signed photo album of President Abraham Lincoln and his cabinet and Senate. Also: a visit to the Ypsilanti Automotive Heritage Museum spotlights model cars made by Hudson Car Company.

Conclusion. In Detroit, items include a signed letter from Charles Schulz that includes a drawing of Linus; letters from Carl Jung and Sigmund Freud discussing Russian ballet dancer Vaslav Nijinsky; and etchings by Edward Hopper and John Sloan. Also: architect-designer Eliel Saarinena is discussed during a visit to the Saarinen House at Cranbrook Academy of Art.

Part 1 of 3 in Baton Rouge. Items include a French Art Deco diamond and platinum ring, circa 1930; a copy of the book "The History of Magic" that features an inscription from the owner's old college roommate—Jim Morrison of the Doors; and four Rembrandt and James McNeill Whistler etchings. Also: Campeche chairs are discussed during a visit to the Magnolia Mound Plantation.

Part 2 of 3 in Baton Rouge. Items include a Louisiana political poster; three paintings by New Orleans artists-Newcomb pottery founders William and Ellsworth Woodward; and a NASA photograph collection. Also: a visit to the to the LSU Museum of Art spotlights the work of Louisiana artist Clementine Hunter.

Conclusion. In Baton Rouge, La., items include an early 19th-century Louisiana work table; a collection of Civil War Confederate letters; and a Porfirio Salinas oil, circa 1935, that was purchased for $100 in 1935 and is now worth $75,000. Also: a rare Civil War hand grenade is discussed during a visit to Port Hudson.

Part 1 of 3 in Kansas City features an 1891 Kansas City Fire Chief presentation badge made by the fine jeweler Mermod & Jaccard; a bold 1796 Chinese bronze censer; and a pristine 1965 Roy Lichtenstein screen print. Also: a visit to the Negro Leagues Baseball Museum spotlights a one-of-a-kind, signed baseball.

Part 2 of 3 in Kansas City, Mo. Items include a beauty book, circa 1928, by Madam C.J. Walker, who was the first American female millionaire; an 1861 E.G. Wright silver cornet; and a 1920 Julian Onderdonk oil painting that the artist gave to the owner's mother. Also: the Toy and Miniature Museum is visited.

Conclusion. In Kansas City, Mo., items include a 1955 Elvis Presley concert poster; an 1812 Marklin "Puritan" toy boat; and a 1919 Leon Gaspard "Portrait of Young Girl" oil painting. Also: Dorothea Lange photography is discussed during a visit to the Nelson-Atkins Museum of Art.

Part 1 of 3 in Anaheim, Cal. Items include a prop duck made for Groucho Marx's "You Bet Your Life" TV show; two sketches by pop star Michael Jackson, circa 1973; and a Frederic Church oil painting, circa 1867. Also: ocean liner memorabilia is discussed during a visit to the Queen Mary ocean liner.

Part 2 of 3 in Anaheim, Cal. Items include two pairs of Buddy Ebsen's performance shoes; a jade jewelry collection; and an oil painting titled "Sacré-Couer et Moulin" by French artist Maurice Utrillo. Also: vintage guitars are discussed during a visit to the Rickenbacker International Corporation headquarters in Santa Ana, Cal.

Conclusion. In Anaheim, Cal., items include an 18th-century Chinese cinnabar lacquer box; a collection of wanted posters, circa 1900, that features a Butch Cassidy wanted circular; and a shadow box that may have been made by Joseph Cornell. Also: costume jewelry is discussed.

Part 1 of 3 in Richmond features a late 19th-century Albert Neuhuys watercolor; a 1982 UNC championship basketball signed by teammates Michael Jordan, James Worthy and Sam Perkins; and an early 20th-century Alice R.H. Smith watercolor. Also: a visit to the Virginia Museum of Fine Art spotlights silver tea and coffee pots.

Part 2 of 3 in Richmond features a 1765 Thomas Pitts silver epergne; a Leveille-Rousseau perfume bottle, circa 1890; and a Tiffany & Co. brooch, circa 1937. Also: Mark L. Walberg tries to stump appraiser Sebastian Clarke on Federal-era materials at the Wilton House Museum.

Conclusion. In Richmond, items include Langston Hughes-signed first editions; a 1935 "Bride of Frankenstein" pressbook that includes many of the graphics used for the film's top posters; and an 1890 Frank Henry Shapleigh oil painting. Also: tall case clocks are discussed during a visit to Colonial Williamsburg.

Updating appraisals from a 1999 visit to Providence, R.I. Included: a Maurice Brazil Prendergast color monotype, circa 1895; a Cartier ruby and diamond compact; and an Edward Farmer jade and gold box that's now worth $250,000-$350,000.

Appraisals from a 1999 visit to Tampa are updated. Included: a fork from the Hindenburg; a costume jewelry hat from around 1950; and a Louis Comfort Tiffany lamp with a "Rose Helmut" shade.

Items discovered during a 1999 visit to Columbus, Ohio, are reappraised. Included: Albert Cheuret art deco clocks; a Marx "Roy Rogers" play set; and a historical collection that includes a letter from Thomas Jefferson.

Appraisals from a 1999 Toronto visit are updated. Items include a Victorian carved oak bed; a Duiffopruggar-style violin; and a Demetre Chiparus "Starfish" bronze.

A 1999 visit to Baltimore is recalled. Included: an Edgar Allen Poe-inscribed book; a Titanic collection; and a Frederick De Wit atlas, circa 1680, that is now worth $50,000-$70,000.

Items appraised during a 1999 visit to Salt Lake City are revalued. Included: Napoleonic prisoner-of-war pieces; a Mormon certificate of gratitude; and beaded Kiowa objects.

A 1999 visit to Des Moines, Iowa, is recalled. Included: a Mickey Mouse toy with its original box; Charles Lindbergh memorabilia; and a Samuel McIntire medallion that is now estimated to be worth $200,000-$300,000.