5. Revolutionary War-Era cannon Found Fully Loaded
This cannon was used on a British ship, possibly the HMS Hussar, which sank in the East River. After an anonymous donation in 1865, it was installed at Fort Clinton in 1905 where it remained on public display until 1996 when the Central Park Conservancy brought it inside a shed at the Ramble to protect it from vandalism. In January 2013, workers were cleaning it when they found it was fully loaded with gunpowder and a cannonball. CBS News reported that more than 800 grams of black powder were found, still capable of firing.