Bertram Grosvenor Goodhue drew on Ancient Egypt to create his high temple-like Central Library. The building is roofed over with a mosaic pyramid and a sculptured torchbearing hand stands at the apex, representing the scientific 'Light of Learning'.
A badge in the Badge Pursuit Challenge can be found here. On the side of the roof that overlooks 5th street there are two tanks. Between those two tanks is another level to the roof. The badge is in the center of that roof between the two tanks. Access is gained by climbing a drain pipe to the right of the entrance. Proceed to climb the scaffold to your left.