Two arches of a Roman bridge were found in the basement of the mosque-tomb complex during a renovation project.
According to legend, during a famine period Danyal was invited to Tarsus and brought prosperity to the city.
The Byzantine Emperor Justinianus I (reigned 527–565) had an alternative course to the east of the city constructed to reduce the risk of floods.
The long-forgotten bridge might have been unearthed in 1946 during a city sewage project when a part of the arch was found.
In 2002, during the renewal of Danyal's Mosque to add a abdestlik ("wudu place"), the constructor unearthed a part of a big arch several meters underground.
After a rescue excavation by the Ministry of Culture and Tourism in 2006, the arch of a drop-vault bridge and an accompanying small building, which houses an Islamic tomb, were unearthed.
The other arches are still buried under the urban fabric, including other valuable historical buildings, and presently they have not been excavated.