The Rock Tombs of Amos are carved into limestone cliffs by Kaunos kings. They’re a UNESCO World Heritage Site, and they’re located in Dalyan, which is just about 10 minutes away from the beach resorts.
The tombs are basically caves with some sarcophagi tucked inside them. They’re pretty cool to explore—you can swim in the cave pools or hike around the area to get an even better look at the site.