A small sign or piece of evidence showing that something existed or happened.
Trace
Without people living there.
Uninhabited
A difficult question or problem that requires thought to solve.
Puzzle
To find an answer to a problem or mystery.
Solve
A ship that moves using steam power.
Steamship
A tall building with a light that helps ships navigate at sea.
Lighthouse
To cause something to fall.
Knock over
Far away from places where people live.
Remote
The act of entering a place; especially with an army; to take control.
Invasion
Not professional; done for enjoyment or as a hobby.
Amateur
A mythical giant snake-like creature said to live in the sea.
Sea serpent
Very unusual or remarkable.
Extraordinary
A curved object used for hanging things.
Hook
To confuse or make it difficult to understand.
Baffle
To take someone away illegally; usually demanding something in return.
Kidnap