What can you compare a giraffe to in height?

A grown giraffe is about 5-6 meters tall (16-20 feet); males are taller than females.

A 2-storey house is about 20 ft high, not counting the roof.

A fully grown Magnolia tree is about 20 ft tall, as is fully grown Black Bamboo.

La Madonna DELLa Lettera is a 20 ft high golden statue that watches over the harbor of Messina on the island of Sicily in Italy.

Those tall, skinny air puppets used for advertising that dance in a stream of air blown into them, they're about 20 ft tall.