Coins from the Thomas Lockwood Collection were recently found to be rare and priceless. From a description by the University at Buffalo, from top to bottom: A gold aureus of the Roman emperor Otho; a tetradrachm of Athens; a tetradrachm of Alexander the Great; a silver tetradrachm of Syracuse (Sicily); a gold aureus of the emperor Nero; and a gold octodrachm of Arsinoe II." Douglas Levere/University at Buffalo hide caption

toggle caption Douglas Levere/University at Buffalo

Thar's gold in them thar cans: One of the eight cans discovered by a California couple. They were stuffed with gold coins minted in the 1800s. The cache's estimated value: $10 million. Kagin's Inc./AP hide caption

toggle caption Kagin's Inc./AP