The Palace of Green Porcelain was an ancient museum that had been long abandoned by the year 802,701. The Time Traveler gave it its name after the texture of the outer walls, which resembled green porcelain.
The Time Traveler found evidence of the Eloi having played inside the palace many times. Additionally, the hallways gradually slope downwards, leading into the Morlock Tunnels. ("The Time Machine: An Invention")