If Upside Down Compass goes, so does "The Jeweled Necklace of Montezuma". Girl drops the monkey over the edge there too, yet no one nitpicks at her.

Season 1:
"Galileo's Cannonball"
"John Sutter the Map to the Lost Gold Mine"
"The Helmet of Genghis Khan"
"The Pendant of Kamehameha"
"The Star of Sultan Saladin"
"The Trojan Horseshoe"
"Henry the Eighth's Great Seal"
"The Lost Log Books of Magellan"
"The Moccasins of Geronimo"
"The Paintbrush of Leonardo da Vinci"
"The Treasure Map of Jean Lafitte"
"The Belly Button of Buddha"
"The Golden Chains of Zenobia"
"The Helmet of Joan of Arc"
"The Stone Marker of Leifr Eir?ksson"
"Alexander and the Gordian Knot"
"The Golden Jaguar of Atahualpa"
"The Medal of Sir Edmund Hillary"
"The Silver Saddle Horn of Hannibal"
"Pecos Bill's Lost Lariat"
"The Codebook of Mata Hari"
"The Dragon Lady and the Blue Pearl"
"Lawrence of Arabia's Headdress"
"The Collar of Davy Crockett"
"The Snake Bracelet of Cleopatra"
"The Treasure of Anne Bonny"
Season 2:
"The Applewood Amulet of Emiliano Zapata"
"The Bone Necklace of the Blackfeet Chief"
"The Diary of Dr. Livingstone"
"The Electrified Key of Benjamin Franklin"
"The Imperial Purple Robe of Empress Theodora"
"The Lucky Medallion of Atocha"
"The Lucky Pillow of Annie Taylor"
"The Mush Pot Hat of Johnny Appleseed"
"The Enormous Iron Nose Ring of Babe"
"The Mask of the Man in the Iron Mask"
"The Missing Eye of David"
"The Plumed Headdress of Cosa Rara"
"The Sacred Ring of Sultan Suleiman"
"The Shriveled Hand of Efoua"
"The Two-Cornered Hat of Napol?on"
"The Very Tall Turban of Ahmed Baba"
"The Golden Goblet of Attila the Hun"
"The Leopard-Skin Cloak of Annie Oakley"
"The Snakeskin Boots of Billy the Kid"
"The Bonnet of Dolley Madison"
"The Golden Earring of Henry Morgan"
"The Levitating Dog Leash of Nostradamus"
"The Milk Bucket of Freyd?s"
"The Missing Weather Maps of Charles Lindbergh"
"The Priceless Portrait of the Polynesian Girl"
Season 3:
"The Bent Shaving Pan of Jedediah Smith"
"The Comet-Embroidered Battle Flag of William the Conqueror"
"The Discarded Seal of Ivan the Terrible"
"The Dried Apple Half of William Tell"
"The Dried Ear of Corn of Sojourner Truth"
"The Golden Spider Web of Robert the Bruce"
"The Good-Luck Watch of Empress Eug?nie"
"The Ivory Hunting Horn of Roland"
"The Jewel-Encrusted Egg of Catherine the Great"
"The Jeweled Scabbard of Sforza"
"The Lily-Crested Crown of Clovis the First"
"The Lion-Headed Bracelet of Chandragupta"
"The Lion-Slashed Jacket of Sacagawea"
"The Lost Hornpipe of the Pirate Captain"
"The Lost Taj Mahal Turban of Aurangzeb"
"The Melted Head of Madame Tussaud"
"The Metal Beard of the Egyptian Queen"
"The Much-Heralded Helmet of Sir Gawain"
"The Mummified Hand of the Egyptian King"
"The Mussel Shell Armor of Apanuugpak"
"The Mysterious Manuscript of Mary Shelley"
"The Mystical Spellbook of the Imperial Wizard"
"The Pearl Necklace of Gwalior"
"The Red Sash of Tokugawa Ieyasu"
"The Royal Torque of Queen Boadicea"
"The Ruby Earring of ibn-Zibab"
"The Secret Map of the Bandit Queen"
"The Thornwood Gavel of Judge Roy Bean"
"The War Fan of the 47 Ronin"