1.   A spiral ramp leads around the entry lobby to both halls.

2.   A spiral ramp winds within the dome.

3.   Each has several openings, spiral ramps, and three or four chambers that may have served as living room, pantry, birthing room and bathroom.

4.   His design for the Reichstag features a glass dome enclosing spiral ramps.

5.   One is a spiral ramp that corkscrews one and a half turns around the sphere, starting at the equator line.

6.   A guide at the Pharaonic Village said one theory involves the construction of a straight or spiral ramp that was raised as the construction proceeded.