Only two backbones and thousands of ribs.

Answer: railroad

More Difficult Riddles with answers

More Difficult Riddles

Pair me with baking, I turn from colored to white, I'm dirt cheap; in stores and restaurants I abound. When I use my alias I can make quite a noise, Or in music, a much more well-liked sound.
People are hired to get rid of me. I'm often hiding under your bed. In time I'll always return you see. Bite me and you're surely dead.
People like this usually live in rural areas, unless they are lucky enough to strike oil and move to Beverly Hills.
Pirates put their booty in it.
Plant whose name sounds like a dish full of dairy spread.
Plow and hoe, reap and sow, What soon does every farmer grow?
Put into a pit, locked beneath a grate, guarded through the night, yet it still goes out.
Puzzle: Who are these people? | Person saw the bridge crossed 3 persons Riddle
Reaching stiffly for the sky, I bare my fingers when its cold. In warmth I wear an emerald glove and in between I dress in gold.
Robert and David were preparing to have a water balloon fight. "No Fair" cried Robert, "You have 3 times as many as I do!" David said "Fine!" and gave Robert 10 more balloons. "Still not fair!" argued Robert, "You still have twice as many as I do." How many more balloons must David give Robert for them to have the same number?
Round as an apple, deep as a cup, and all the kings' horses can't fill it up. What is it?
Round like a dishpan and smaller than a bathtub. But the ocean can't fill it. What is it?