Frederiks Kirke a lovely Evangelical Lutheran church located near the Amalienborg Palace. It is certainly worth to climb to the top of the church for a great view of the palace. The large dome of the church is the biggest in Scandinavia and was inspired by the Saint Peter's Basilica in Rome. The church is a very popular wedding spot for the locals so you might be able to see a wedding if you're lucky. The church is open every day and it is free to enter but you have to pay if you want to climb to the top.