The Periodic Table of Storytelling -- This amazing graphic takes some of the thousands of tropes (conventions and devices found within creative works) from the TV Tropes wiki and sets them out in a very creative way. / Nov 12 '13
The Catacombs in Alexandria are so called because the design was very similar to the Christian Catacombs in Rome. Most likely it was a private tomb, later converted to a public cemetery. It consists of 3 levels cut into the rock, a staircase, a rotunda, the triclinium or banquette hall, a vestibule, an antechamber and the burial chamber with three recesses in it; in each recess there is a sarcophagus. The Catacombs also contain a large number of Luculi or grooves cut in the rock.
Historically, mapmaking was a fairly imprecise task . . .to fill blank areas on the maps, mapmakers used to include textual/graphic warnings of the dangers of going into uncharted territory. Such warnings took the form of sea serpents, dragons, mythical and, sometimes, even real creatures. The actual line "Here There Be Dragons" has been found only once, on the 16th-century Lenox Globe — but is too cool to give up.