Finished in 2005, this building used to house the upper house of the Parliament of Tunisia. It didn't serve this purpose for very long; after the 2011 revolution the Tunisian parliament was made unicameral and the counselor chamber has been empty ever since.
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Le Musée National du Bardo
Occupying the 13th-century palace of the Ottoman-era bey (ruler) and renowned for its extensive collection of Roman mosaics, although the (huge) collection covers Tunisia's entire existence from the prehistoric era until the Ottoman days. Exhibits from Carthage, Mahdia, Sousse, many from the Roman period in addition to presentations of Arabian culture old and new. It can be mercilessly hot and stifling in the museum, so bring water. The only bathrooms are on the ground floor, and have attendants asking for change. The museum is segregated into old and new, so be sure to walk around a fair amount looking for new passages to be sure you haven't missed any major areas.
Another gate, constructed in 1350 with one arch, then rebuilt in 1881 with three arches to facilitate commerce.
Not a hotel, but the city hall. The building was inaugurated in 1998 and is a combination of traditional and modern architecture with large windows, Middle Eastern patterns and arches. The city hall also features a lot of Tunisian flags, and has a striking flagpole structure on the square in the front of the main entrance.
Médina de Tunis
The world heritage listed old town is a must-see colorful, crowded labyrinth of decorated old houses, vaults and street vendors. You can move around by foot only. You get a feel of medieval life.
Mosquée Sidi Youssef Dey
Opened in 1631, this was the first Ottoman mosque to be built in Tunis. It is the largest Hanafi mosque in the city, was extensively restored in the late 19th century and is now a part of the University of Ez-Zitouna. A historical monument, the Youssef Dey mosque has a beautiful octagonal minaret and white marble mausoleum.