After you see the main sights in Santorini, save time for a lesser-known side of the island, too. From castles to a crater and cliffside villages, here are must-visit places in Santorini, Greece.

I'm a Greece-based professional travel writer and hotel reviewer who visits Santorini every year. Here's my ultimate guide for every step of planning a once-in-a-lifetime trip to Santorini, Greece.

Here's what you need to know to visit Oia, one of the most scenic towns in the Greek Islands.