Question: What legionary fortress located on the site of the modern city of Chester is a popular landmark to photograph?

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Deva Victrix: Deva Victrix, or simply Deva, was a legionary fortress and town in the Roman province of Britannia on the site of the modern city of Chester.  The fortress was built by the Legio II "Adiutrix" in the AD 70s as the Roman army advanced north against the Brigantes, and rebuilt completely over the next few decades by the Legio XX "Valeria Victrix".  In the early 3rd century the fortress was again rebuilt.  The legion probably remained at the fortress until the late 4th or early 5th century, upon which it fell into disuse.

Isca Augusta: Isca, variously specified as Isca Augusta or Isca Silurum, was the site of a Roman legionary fortress and settlement or "vicus", the remains of which lie beneath parts of the present-day suburban village of Caerleon to the north of the city of Newport in South Wales.  The site includes Caerleon Amphitheatre and is protected by Cadw.

Hajar an-Nasar: Hajar an-Nasar ("the eagle's rock") is an ancient fortress located in northern Morocco.  It was constructed in the 10th-century by the Idrisid dynasty.  The archaeological site is situated on a rocky crest overlooking the headwaters of a tributary of the Loukkos River around 40 km almost due east of the modern city of Larache.

Bala Hissar, Kabul: Bala Hissar is an ancient fortress located in the city of Kabul, Afghanistan.  The estimated date of construction is around the 5th century AD.  Bala Hissar sits to the south of the modern city centre at the tail end of the Kuh-e-Sherdarwaza Mountain.  The Walls of Kabul, which are 20 ft high and 12 ft thick, start at the fortress and follow the mountain ridge in a sweeping curve down to the river.  It sports a set of gates for access to the fortress.  The Kōh-e Shēr Darwāzah (lion door) mountain is behind the fort.

Castra Albana: The Castra Albana ] was a permanent legionary fortress of the "Legio II Parthica", founded by the Emperor Septimius Severus (193-211) on the modern site of Albano Laziale.  Today, the ruins of the structures inside the castra, such as the so-called Baths of Caracalla and the Amphitheatre represent one of the largest collections of Roman archaeological remains in Latium, outside of Rome.

History of Perth, Scotland: Perth (Scottish Gaelic: "Peairt" ) is a city and former royal burgh in central Scotland.  There has been a settlement at Perth since prehistoric times.  Finds in and around Perth show that it was occupied by the Mesolithic hunter-gatherers who arrived in the area more than 8,000 years ago.  Nearby Neolithic standing stones and circles followed the introduction of farming from about 4000 BC, and a remarkably well preserved Bronze age log boat dated to around 1000 BC was found in the mudflats of the River Tay at Carpow to the east of Perth.  Carpow was also the site of a Roman legionary fortress.

Eastgate and Eastgate Clock: Eastgate and Eastgate Clock in Chester, Cheshire, England, stand on the site of the original entrance to the Roman fortress of "Deva Victrix".  It is a prominent landmark in the city of Chester and is said to be the most photographed clock in England after Big Ben.

Petavonium: Petavonium was a Roman Legionary Fortress "(castrum)" of the Legio X Gemina, and later a Roman city formed from the canabae, or civilian camp.  It was located in the valley of Vidriales in an area of the modern Santibanez de Vidriales and its hamlet Rosinos de Vidriales, in the province of Zamora (Castilla y Leon).

Caerleon: Caerleon ( ; Welsh: "Caerllion" ) is a suburban town and community, situated on the River Usk in the northern outskirts of the city of Newport, Wales.  Caerleon is a site of archaeological importance, being the location of a notable Roman legionary fortress, Isca Augusta, and an Iron Age hillfort.  The Wales National Roman Legion Museum and Roman Baths Museum are in Caerleon close to the remains of Isca Augusta.  The town also has strong literary associations, as Geoffrey of Monmouth makes Caerleon one of the most important cities in Britain in his "Historia Regum Britanniæ", and Alfred Lord Tennyson wrote "Idylls of the King" while staying there.

Lindum Colonia: Lindum Colonia, was the Roman name for the settlement which is now the City of Lincoln in Lincolnshire.  It was founded as a Roman Legionary Fortress during the reign of the Emperor Nero (58-68) or possibly later.  Evidence from Roman tombstones suggests that Lincoln was first garrisoned by the Ninth Legion, "Hispana" which probably moved from Lincoln to found the fortress at York around c.71 A.D. Lindum was then garrisoned by the Second Legion "Aduitrix", which then went on to Chester in 77-8 A.D.

Supporting paragraphs: Eastgate and Eastgate Clock Deva Victrix
Answer: Deva Victrix