DENVER — If buildings could talk, the dusty storage structure that has rested for decades in a park beneath the Granada's water tower might tell stories about the seventh-graders who giggled and chattered as they assembled floats for the annual homecoming parade. But the building speaks most eloquently about its function from 1942 to 1945, as a recreation hall at the Granada War Relocation Center — a square mile just outside of town better known as Amache, a World War II internment camp for Japanese-Americans.