Nicolas Lenau College (Liceul Nicolas Lenau), located on the north side of the square, was built in 1761 and was home to the earliest theatre in Timisoara.
The baroque Serbian Orthodox Cathedral (Biserica Orthodoxa Sarba), built in 1745-48, and the mint green and white Serbian Bishop's Residence (Vicariatul Ortodox Sarb) with its extravagant decorations are located on the west side of the square. The Cathedral can be visited daily between 7am and 6pm.
The impressive 18th century Baroque Palace (Palatul Vechii Prefecturi) dominates the square's south side. Formerly the governor's residence, it now houses the Museum of Fine Arts with works by German, Flemish and Italian artists.
At the northwest corner of Piata Unirii stands the spectacular Scont Bank (Banca de Scont). This typical Hungarian-style art nouveau structure, built in the early 20th century, features an organic shape comprising curved walls studded with turquoise tiles forming patterns drawn from folklore, and extravagant iron gutters and window grills.
Continue along Str. Lucian Blaga to the 14th century Huniade Castle (Castelul Huniade). Built during the rule of Carol Robert, Prince de Anjou, it was completed by Iancu of Hundeoara and redesigned by the Habsburgs in the 18th century.
South and east of the Bega Canal are the Josefin, Elisabetin and Fabric residential districts, true gems of Jugendstil, or art nouveau, architecture, built mainly in the late 19th century. The small residential square of Piata Plevnei, south of the Bega Canal, is bordered by excellent examples of the first phase of Secessionist architecture, such as Gemeinhardt's Peacock House (Casa cu Pauni) built in 1905. Facades are covered with an abundance of typical motifs: peacocks, swans, owls and squirrels together with sinuous vines and foliage. The theme continues on the buildings lining Splaiul Tudor Vladimirescu, following the south bank of the Bega, and to a lesser extent, around nearby Piata Maria and Bulevardul 16 Decembrie 1989.
Secessionist, or art nouveau, architecture also can be found in the cities of Arad (especially on Strada Closca and Piata Avram Iancu), Oradea (Vulturul Negru and Astoria hotels), Cluj (Odon Lechner National Theatre), Satu Mare and Targu Mures (Palace of Culture).