<span>"La Rambla is a street in central Barcelona, popular with tourists and locals alike" (Wikipedia). This is a very popular street in which many residents and tourists are familiar with. </span>
Las Ramblas is a very popular shopping street in Barcelona, lined with many trees. It is known for its small shops, markets, but also its larger stores too. It is very popular, and known well by tourists and natives.
The preposition "a" precedes the direct object and goes after the verb which refers to people (and sometimes animals). For example: Yo conozco a María.