I found this expression on this reading passage:
The RMS Titanic left Southampton for New York on April 10, 1912. On board were some of the richest and most famous people of the time who had paid large sums of money to sail on the first voyage of the most luxurious ship in the world. Imagine her placed on her end: she was larger at 269 metres than many of the tallest buildings of the day.
I can't really understand what "Imagine her placed on her end" means here. Can anybody help me explain what this means?