The longest musical performance in history is currently taking place in the church of St. Burchardi in Halberstadt, Germany. The performance of John Cage's "Organ²/ASLSP (As Slow As Possible)" started on Sept. 5, 2001, and is set to finish in 2640. The last time the note changed was October 2013; the next change isn't due until 2020.
There's an opera house on the U.S.–Canada border where the stage is in one country and half the audience is in another.
The largest snowflake ever recorded reportedly measured 15 inches across.
There are around 60,000 miles of blood vessels in the human body. If you took them all out and laid them end to end, they'd stretch around the world more than twice. But, seriously, don't do that either.