Unknown identity

A museum

My mother who passed away had inspiration.
Because I can not see a ghost, I can not affirm that my mother's ability is real.
It is a story I heard from such a mother.

My mother went with a friend to a museum in the prefecture.
My mother was the first time to go to the museum. My mother was watching the exhibits one by one.
"What is this?" When my mother thought, There was a person who explained politely "This is a thing to use for △△ at ○○."
When my mother saw that person, there was a man wearing armor in the Warring States period.

Besides, there was a person who matched the era of exhibits such as samurai and princess. Everyone explained the exhibits.
My mother thought, "This museum has an interesting service."
Then my mother's friend said to my mother.
"Who are you talking to?"
At that time my mother noticed.
"The man who I was talking to was a ghost ..."

My mother told me.
"I did not think it was a ghost because I saw it clearly." Because it says "This is a princess's wedding tool, this is what I carried" or "This is what I was using", so I thought it was detailed content."

I have never been to the museum yet. But, I wonder if I can not see the ghosts.