Cities Without Houses?

Riddle: I hold the keys to places with no real traces. There are cities sans houses, mountains without trees, and waters lacking fish. To find out what I am and unlock more fun word. What could I be?

Answer: A map.

Source: https://www.riddles.com/11562

I hold the keys to places with no real traces. There are cities sans houses, mountains without trees, and waters lacking fish. To find out what I am and unlock more fun word. What could I be? — Cities Without Houses? by candice-ele v1.

Riddle: I hold the keys to places with no real traces. There are cities sans houses, mountains without trees, and waters lacking fish. To find out what I am and unlock more fun word. What could I be? Answer: A map. — by candice-ele v2.