Constanța Old Town

Constanța presents itself in layers that span two and a half thousand years of continuous urban life, the most legible of which is the compact Ottoman-era old town centred on the pedestrianised Ovidiu Square, where the Roman poet Ovid spent his exile from Rome and where his bronze statue still presides over the square's outdoor cafés in a location that has been a gathering place for the city's residents for centuries.

The 6th-century Genoese Lighthouse, at 17 metres the second-oldest surviving lighthouse in the world after the one at La Spezia in Italy, stands at the harbour's edge and is the most ancient piece of built infrastructure still in place on the Black Sea coast, having survived Byzantine, Genoese, Ottoman and Romanian periods without significant interruption in its basic function.

The National History and Archaeology Museum holds the Roman mosaic floor from a 4th-century merchant's house that was discovered beneath the city in 1989 during construction work and raised intact, an extraordinary piece of late-Roman figurative work depicting scenes of the wine god Dionysus and his retinue that was clearly commissioned by a wealthy merchant whose house stood on what was then the main street of Tomis.

The Great Mosque of Constanța, built in 1913 on the site of an earlier Ottoman structure, is faced with white stone quarried locally in Dobruja and has a minaret that is visible from much of the harbour area; its interior includes Turkish ceramic work, carved wooden furniture and a carpet donated by the Ottoman sultan, and is one of the most intact Ottoman religious buildings surviving on the Romanian Black Sea coast.

The art deco Casino, built in two stages between 1910 and 1937 and standing at the end of the summer pavilion promenade, is widely considered one of the finest pieces of 1930s Black Sea coastal architecture in southeastern Europe, its curved concrete elevation and horizontal window bands a radical departure from the surrounding 19th-century urban fabric and a statement of modernist ambition for the coast.

The Roman Ovidius Mole, a stone breakwater constructed under the Roman Emperor Trajan and still substantially intact in the harbour, marks the antiquity of the port's infrastructure and its continuity of use from antiquity through the medieval Genoese period to the present day, making it one of the oldest pieces of continuous harbour engineering surviving anywhere in Europe.

The city's main arterial promenade along the Black Sea front has been progressively renovated since 2012 and now provides a continuous pedestrian and cycling route connecting the old town harbour with the Mamaia resort immediately to the north, linking the historical core with the modern beach infrastructure that has made the Constanța-Mamaia area Romania's most visited seaside destination.

The aquarium and dolphinarium near the southern harbour, dating from 1958 and expanded several times since, draws domestic visitors in large numbers in summer and represents the Soviet-era investment in marine science public institutions that characterises several Romanian Black Sea coast cities; the dolphin shows are popular with children and the aquarium's collection includes Black Sea species as well as tropical exhibits.

The Genoese Lighthouse is the second-oldest surviving lighthouse in the world and one of the most tangible physical links to medieval maritime activity on the Black Sea, having been in continuous if imperfect use for fifteen centuries.

The Roman mosaic and Ovidiu Square together give Constanța an unusual density of ancient, Roman and Ottoman heritage within a single compact pedestrian area, making it one of the most historically layered urban spaces on the Black Sea coast.

The art deco Casino is an architectural landmark that anchors the modern summer promenade and represents the interwar period when the Black Sea coast was being developed as a leisure destination for the Romanian middle class.