The Lighthouse of Alexandria was built in the time of Ptolemy II and was the second largest structure ever constructed at the time after the Great Pyramid of Giza. Learn about how it stood for over 1,000 years until a series of earthquakes (and a Tsunami) brought it crashing to the earth. 

Hidden below the waves, it took one very ambitious diver to find it. Plus we talk about whales for a while (turns out they're neat).