Huaisheng Mosque boasts Guangta is believed to be the world’s oldest minaret outside Mecca dating back to the 7th Century. The mosque was the pivotal point of the 15th-century foreign quarter but is open only for Muslims or tour groups.

The onyx black sand of Reynisfjara is formed from volcanic activity in Iceland: when lava collides with the ocean, it rapidly cools and shatters into small fragments of basalt. With its enormous basalt stacks (features in Game of Thrones and once believed to be petrified trolls), roaring Atlantic waves and stunning vistas, Reynisfjara is widely considered to be the most beautiful example of Iceland’s black sand beaches. The sea stacks along the shore are home to thousands of nesting seabirds like puffins, fulmars and guillemots — a must-see for birdwatchers. A visit to Reynisfjara is included in most tours of southern Iceland. Driving here is a good option, too, since it's only about 180 km from Reykjavík.

Galerie Estades is an interesting gallery which focuses on 20th-century contemporary art, featuring paintings, sculptures, and glasswork.

Once owned by Richard II of England, the castle is the city’s foremost landmark and oldest monument. The structure boasts more than 1,700 years of history and still serves as a military fortress today. Don't miss the Navy Museum inside!