We all know a foghorn warns ships of land masses and a leghorn is a piece of straw. Put them together and you have a character straight out of Looney Tunes. What does that have to do with this quiz? Not much, except maybe the foghorn part. What we're really talking about here is the foghorn's counterpart, the lighthouse -- trusted beacon of mariners for thousands of years.

Let's start from the beginning. Though technically not structures, it's believed that the earliest lighthouses were:

Fireworks in Southeast Asian harbors

Giant wax candles

Bonfires built on hillsides

A guy with a flashlight spinning around