How do you fix a broken tuba?

I am a protector who sits on a bridge. One person can see right through me, while others wonder what I hide. What am I?

Latest riddles:

Riddle: What word can go before binder, fence and worm?

What word can go before binder, fence and worm?

Riddle: While masons often call me home, you'll likely think me wood and not stone. What am I?

While masons often call me home, you’ll likely think me wood and not stone. What am I?

Riddle: What word can go before ahead, rope and suit?

What word can go before ahead, rope and suit?

Riddle: What kind of animal will pester you?

What kind of animal will pester you?

Riddle: What kind of fish chases a mouse?

What kind of fish chases a mouse?

Riddle: How do you turn six into nine without adding anything or rotating it?

How do you turn six into nine without adding anything or rotating it?