Christiansø is a beautifully preserved 17th-century island fortress, an hour's sail north-east of Bornholm. The entire island is an unspoiled reserve - no cars or modern buildings and no cats or dogs. Christiansø (population 100), is connected to its sister island, Frederiksø, by a footbridge.
Christiansø's Store Tårn (Great Tower), built in 1684, is an impressive structure with a 25 metre diameter. The tower's century-old lighthouse offers a splendid 360 degree view of the island. The Lille Tårn (Little Tower) on Frederiksø dates from 1685, and is the site of the local-history museum.
Breezy days are perfect for walking along the fortified stone walls and cannon-lined batteries that surround the perimeter of the island. There are skerries with nesting seabirds and a secluded swimming cove on Christiansø's eastern side. Boats sail to Christiansø from Bornholm from May to late September, while the mailboat makes the trip year-round.

