Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Frontiers of the Roman Empire' has mentioned 'Watchtowers' in the following places:
Occurrence Sentence Text Source
From the 1st to the 2nd century, the Gask Ridge and the Stanegate, with their chains of Roman camps and watchtowers, marked the northern boundary of Britannia.
Security and monitoring on the coasts in the west and southeast was achieved by camps and by chains of watchtowers or signal towers, both along the coastline and along main roads in the interior.
Monitoring and coastal surveillance were carried out by a chain of watchtowers or signal towers, camps and fortified ports (Gaul).
The guards were stationed in nearby castra and watchtowers usually built immediately on the Rhine.
From about 162/63 AD, the Romans constructed a defensive barrier with watchtowers and signal towers, palisades, ditches and earthworks.
Between them a dense chain of watchtowers and signal towers was constructed to provide an additional security measure (burgi).
Between the camps, in strategic places or good points of observation, were watchtowers or signal towers and, in the Late Antiquity, burgi.
In the middle section, between the camps of Favianis and Melk, watchtowers were built only sporadically.
The gaps between the camps were closed by a chain of watchtowers or signal towers.
In the time of Emperor Marcus Aurelius the first mention is made in Pannonia of stone watchtowers (burgi, panelled towers and fortlets (praesidia).
The Fossatum is accompanied by many small watchtowers and numerous forts, often built within sight of one another.
Together, the remains of the frontiers, consisting of vestiges of walls, ditches, earthworks, fortlets, forts, fortresses, watchtowers, roads and civilian settlements, form a social and historical unit that illustrates an ambitious and coherent system of defensive constructions perfected by engineers over the course of several generations.
There are a number of reconstructions of elements of the frontier such as forts and watchtowers.