While historic, Las Ramblas is jam packed with tourists and probably a few locals that would rather be anywhere else in Barcelona.
There are as many as 10 different buildings or monuments to view when you are on this long, straight street in Barcelona. Las Ramblas is, in fact, a main street in the Old Town neighborhood, so a walk will help you get your barrings for the rest of your stay.
In addition to these sites, you should also look for Barcelona’s first official public clock, the great palace and the Font de Canaletes. Here’s a shot of the fountain at night. If you hear someone “drinks the waters of Canaletes” you’ll know they are from Barcelona.