If you have ever heard someone refer to a situation or person as "solid as a rock", then you should know that it speaks of strength and impregnability associated with the Rock of Gibraltar. The Rock of Gibraltar is renowned as the strongest rock in the world and stands as one of the most important landmarks located in the British overseas territory of Gibraltar. With an interesting history that dates back to the time of the Legendary Hercules, to a modern-day interest for tourists and geologists, the Rock of Gibraltar is truly worth a visit.