Laodicea is mentioned only in Paul’s epistle to the Colossians (2:1; 4:13-16) and in the Revelation of John (1:11; 3:14). Paul says that Epaphras worked diligently for the saints in Colossae, Laodicea, and Hierapolis.
Here is a photo of the ruins of the stadium at Laodicea. Mount Cadmus can be seen in the distance to the east. Colossae was located at the foot of Mount Cadmus. Hierapolis was located to the north of Laodicea.
The stadium was an enclosed structure used for gladiatorial games. An inscription tells that a wealthy family dedicated it to Vespasian and Titus. One still can make our the unexcavated ruins of the 1000 feet long stadium.