Timgad is an ancient Roman city located in the Aurès Mountains of Algeria. It was founded in 100 AD by the Roman Emperor Trajan as a military outpost to guard against the local Berber tribes. Over time, it grew into a prosperous city with a population of up to 15,000 people, and became an important center for trade and commerce in the region.

Timgad was laid out in a grid pattern, with a main street running east to west, and several smaller streets and alleys running north to south. The city's public buildings were located along the main street, and included a large basilica, a theater, and a library. There were also several public baths and a market area.

Timgad was abandoned in the 7th century, after the Arab conquest of North Africa. The city was buried under sand and soil for many centuries, which helped to preserve many of its buildings and artifacts. In the 19th century, European archaeologists began to excavate the site, and today, Timgad is one of the best-preserved Roman cities in North Africa. Visitors to the site can see the ruins of many of the city's buildings, including the basilica, the theater, and the public baths.