It is amazing that the Column of Trajan, a testament to Emperor Trajan's military exploits (98-117 AD), still stands. This intricately carved spiral column was once part of a large complex between two libraries, allowing scenes to be viewed while walking through surrounding buildings. It contains a central staircase, though closed to the public. The area offers reasonable places to eat.

The religion of ancient Rome called for animal sacrifice on an altar. To protect the priest from seeing any bad omens, the altar was...