The Clay Castle in the Valley of Fairies, located in Transylvania, Romania, is a charming construction made from cob, straw, sand, and other sustainable materials. Created by a Romanian couple with a dreamy vision, this fairy tale-like castle is set to become a hotel in the future. Visitors can currently explore the picturesque surroundings, grab a snack, and snap some Instagram-worthy photos of this magical place nestled among the mountains.