My Opinion would probably be this:
#25 - #203: The Golden Stallion of Ali Baba (Not Top 25 material)
#24 - #335: The Lost Whale Bone of Pytheas (Fine here)
#23 - #318: The Mysterious Manuscript of Mary Shelley (Fine here)
#22 - #316: The Golden Spider Web of Robert the Bruce (Fine here)
#21 - #206: The Lost Love Letter of Captain John Smith (Fine here)
#20 - #313: The Smashed Printing Plate of Frederick Douglass (MUCH higher, I'd say just barely missing Top 10 for me).
#19 - #120: The Oracle Bowl of Delphi (A little higher)
#18 - #319: The Dried Apple Half of William Tell (Higher, probably just missing Top 10 like Frederick Douglas).
#17 - #121: The Paintbrush of Leonardo da Vinci (Fine here)
#16 - #205: The Walking Stick of Harriet Tubman (Fine here)
#15 - #107: Elizabeth I's Golden Ship (Fine here)
#14 - #125: The Stone Marker of Leif Eiríkson (Lower)
#13 - #227: The Crown of Queen Nzinga (Maybe a little higher)
#12 - #124: The Stolen Arm of Shiva (Fine here, maybe a little lower)
#11 - #119: The Treasure Map of Jean Lafitte (Much lower)
#10 - #210: The Cracked Crown of the Spanish King (Good)
#9 - #236: The Missing Weather Maps of Charles Lindbergh (Fine here, if not a tad lower)
#8 - #212: The Stone Head of the Evil King (Lower)
#7 - #202: The Secret Battle Plan of Nathan Hale (Fine here definitely)
#6 - #224: The Lost Lion Tail of Little John (Fine here)
#5 - #105: John Henry's Lost Hammer (Fine here)
#4 - #110: The Keys to the Alhambra (Fine here)
#3 - #101: Blackbeard's Treasure Map (Fine here)
#2 - #301: The Bifocal Monocle of One-Eyed Jack (Fine here for sure)
#1 - #106: The Golden Cricket Cage of Khan (Fine here FOR SURE)
Others I would insert into The Top 25:
The Marble Armrest of Xerxes (I would rate it say around 6-10)
The Snow Cone of Mt. Kilimanjaro (Also say around 6-10)
The Lucky Pig of Amelia Earhart (This temple run sucked, even if it was a hard layout. This should have been at least Top 20).