What are some achievements of architecture in ancient rome?

The two most imposing building were Amhitheatrum Flavuanus ( nicknamed the Colosseum) with an elliptical perimetre of 542 metres (1,788 ft) 189 meters (615 ft) long, and 156 meters (510 ft) wide, a base area of 6 acres (24,000 m2) and an outer wall 48 metre (157 ft) high; theBaths of Diocletian which measured 356 X 316 metre (1170 x 1037 ft); the Baths of Caracallawhich measured 323 x 323 metres (1060 x 1060 ft); the Basilica of Maxentius which had e nave of 25 by 80 metres (83 x 265 feet) and aisles measuring 23 X 17 metres (75 x 56 feet), giving a total width of more than 60 metres (197 ft) and a floor space of 4000 square metre; and the temple of Jupiter Optimus Maximus which measured 60 m × 60 m (200 ft × 200 ft).Nero built the Baths of Nero which were the first large and monumental baths, but they have not survived and little is known about them.

The Circus Maximus was the Chariot Racing track. It measured 621 X 118 metre (2,037 X 387 Ft) ft). Ancient writers said it could accommodate 250,000 spectators but, modern historians have revised this figure to 150,000. It had monumental building on its north-eastern and eastern sides. The smaller Circus Flaminus hosted horseback races and horseback fights.

The threatres were the Theatre of Pompey, the Threatre of Marcellus and the Theatrum Pons Aurelius.

There were also large imperial palaces, but they have not survived. The most imposing one was the Domus Aurea (Golden House) of Nero which covered part of the Esquiline Hill. it was a vast complex with many buildings, large gardens, groves, vineyards and pastures with animals and a man-made lake in the marshy lowland where the Colosseum was built later. Its size has been estimated at between over 300 acres (1.2 km2), and under 100 acres (0.40 km2).

Very long porticoes were built along the Imperial Fora (plural of Forum) which were built by Augustus, Nerva and Trajan. Julius Caesar also built a forum. Imposing public warehouses were built the Emporium a port on the river Tiber.

Two giant lighthouses were built at Portus, the port of the sea coast built near Ostia: the Claudian lighthouse and Trajan's lighthouse. Claudius and was moDELLed on the Pharos of Alexandria (one of the Seven Wonders of the Ancient World) and the other was built by Trajan. Archaeological finds indicate that they were 1,000 metre (1 mile) and 1,320 metre (4,331 ft., more than ¾ of a mile) long respectively. The Claudian lighthouse probably had six floors and might have been 120 metre (394 ft) high.