Lions!!

Lions traditionally were mythological creatures.  They were put in front of entrances as it was believed they had the power to ward off evil spirits.  They were almost always in pairs (male and female).  You can also tell what dynasty it was from by the decoration and how big the muscles are. 

 It seems they were usually carved out of stone, but there were also metal examples.

 I loved this one carved out of coral in the "Treasure" section of the Forbidden City."

This one is my personal favorite.  He looks so happy... until you notice that he's holding a squealing little lion under his sharply clawed paw.  I guess nobody really ever wanted a friendly lion guarding their gate.