Stóragjá is a hidden gem in North Iceland, tucked away near Reykjahlíð. This unique rift features a cave filled with naturally-heated geothermal water, but don't be tempted to take a dip - the water may look pretty, but it's not safe for bathing due to dangerous algae and bacteria. While it may not have the same fame as Grótagjá cave from Game of Thrones, Stóragjá is definitely worth a visit for those looking to explore off-the-beaten-path attractions in Iceland.