Qasr Al Hosn, the oldest and most significant building in Abu Dhabi, was built around the 1790s as the city's first permanent structure, initially serving as a watchtower to oversee coastal trade routes and protect the growing settlement. Over the centuries, it has been the home of the ruling family, the seat of government, a consultative council, and a national archive. Today, it stands as a living memorial and narrator of Abu Dhabi's history. The main entrance is adorned with colourful Islamic-style tiles, and inside, centuries-old mashrabiya screens and carved wooden doors showcase the enduring architectural beauty.

The Roman Theatre was built between the first and second century AD, on behalf of Quinto Petronio Modesto from Trieste and it can hold about 6,000 spectators. The statues that adorned the theatre are now preserved in the Town Museum.

Kastellet, a fortress island situated just off the port entrance of Karlshamn, stands as a testament to historical conflicts during the 17th-century feuds with the Danish. Beyond its historical significance, Kastellet provides the picturesque backdrop for a beloved local theatre performance held during the summer months. Accessible by boat from the inner harbour in Karlshamn during the summer season, Kastellet invites exploration and appreciation of its rich history and scenic allure.