Ærø or ‘Aero’ is one of those destinations in Denmark that doesn’t get a lot of attention but is a hidden gem that any traveller who is anxious to find something a little bit different should try their best to visit. Ærø is a tiny island surrounded by the Danish Baltic Sea – only 30 km in length and 8 km wide. But it being so small makes it the perfect place for travellers to visit and explore either on foot or by bike.