Today, Aquileia is a town smaller than the colony first founded by Rome. Over the centuries, sieges, earthquakes, floods, and pillaging of the ancient buildings for materials means that no edifices of the Roman period remain above ground. The site of Aquileia, believed to be the largest Roman city yet to be excavated, is inscribed on the UNESCO World Heritage List.
Excavations, however, have revealed some of the layout of the Roman town such as a segment of a street, the north-west angle of the town walls, the river port, and the former locations of baths, of an amphitheater, of a Circus, of a cemetery, of the Via Sacra, of the forum, and of a market. The National Archaeological Museum contains over 2,000 inscriptions, statues and other antiquities, mosaics, as well as glasses of local production and a numismatics collection.
The most striking remains of the Roman city are those of the port installations, a long row of warehouses and quays that stretch along the bank of the river. These were incorporated into the 4th century defences, substantial traces of which can be seen today.
The Broch of Clickimin is a large and well preserved, though somewhat restored broch near Lerwick. Originally built on an island in Clickimin Loch (now increased in size by silting and drainage), it was approached by a stone causeway. The water-level in the loch was reduced in 1874, leaving the broch high and dry. The broch is situated within a walled enclosure and, unusually for brochs, features a large 'blockhouse' between the opening in the enclosure and the broch itself. Another unusual feature is a stone slab featuring sculptured footprints, located in the causeway which approached the site. Situated across the loch is the Clickimin Leisure Centre.