The city's old town is still unspoilt by mass-tourism, though it is increasingly being exposed to more and more visitors from abroad, following the lifting of the UN embargo in 2003. However, the walled medina retains much of its serene old-world ambience.

The Assaraya al-Hamra (the Red Castle), a vast palace complex with numerous courtyards, dominates the city skyline and is located on the outskirts of the medina. There are some classical statues and fountains from the Ottoman period scattered around the castle.

The Gurgi and Karamanli mosques, with their intricate decorations and tilework, are examples of the artistic skills of local craftsmen. Just outside the Gurgi mosque is the Arch of Marcus Aurelius, the only surviving Roman monument in the city. More and more palaces (especially from the Karamanli period) are also being restored and opened to the public.

The basic street plan of the medina was laid down in the Roman period when the walls were constructed as protection against attacks from the interior of Tripolitania, and are considered well planned, possibly better than modern street plans. In the 8th century a wall on the sea-facing side of the city was added.

The Hotel Al Kabir (Grand Hotel).Three gates provided access to the old town: Bab Zanata in the west, Bab Hawara in the southeast and Bab Al-Bahr in the north wall. The city walls are still standing and can be climbed for good views of the city. The Bazaar is also known for its traditional ware; fine jewellery and clothes can be found in the local markets.

The Jamahiriya Museum, a fine modern facility located in the Red Castle, is Libya's national museum. It houses many artefacts from the country's Roman and Greek periods, including treasures from the World Heritage sites at Leptis Magna and Sabratha, as well as such curiosities as the Volkswagen Beetle car driven by Gadaffi in the 1960s.