The white part of your fingernail is called the lunula.
Madrid is the only European capital city not situated on a river.
The name for fungal remains found in coal is sclerotinite.
The Boston University Bridge (on Commonwealth Avenue, Boston, Massachusetts) is the only place in the world where a boat can sail under a train driving under a car driving under an airplane.
Emus cannot walk backwards.
It is believed that Shakespeare was 46 around the time that the King James Version of the Bible was written. In Psalms 46, the 46th word from the first word is shake and the 46th word from the last word is spear.
The shopping mall in Abbotsford, British Columbia, Canada has the largest water clock in North America.