"At Topkapi Palace, the seat of Ottoman power for four centuries, history lives in the details. Among the towering gates, jewel-encrusted thrones, and ornate tilework, there are tiny doors cut into the stone — no taller than a man's hand.
They were not for servants. They were not for children.
They were for cats.
"For centuries, the sultans of the Ottoman Empire kept cats in the palace to control rodents that threatened manuscripts, food stores, and silk fabrics. The miniature doors allowed the palace's feline residents to move between chambers without waiting for a human to open the heavy wooden doors."
Photo and text from 'General knowledge'