There is something spooky yet fascinating about seeing places of the dead. If this sounds interesting to you, swing by Lycian Tombs of Myra.
If you love the word "free" as much as most people do, you'll be happy to know this tomb site is exactly that. Lycian Tombs of Myra is located in Demre. To keep your travel schedule full while you're in the area, also drop by Myra Ruins, St. Nicholas Church and Andriake Port Ruins.