Discovered in the centre of Bulgarian capital Sofia in 2004-2006, during excavations works preceding the construction of a hotel. The construction works were not timely stopped and currently a part of these remnants can be seen in the basement of the Serdica hotel. Public access is granted from 10 to 16 o'clock every day except Monday.
https://www.academia.edu/317573/Roman_Entertainment_in_S%D0%B5rdica-Sofia