Established in 1999, the Botanical garden of Barcelona is located at the top of Montjuïc, near the stadiums used in the 1992 Summer Olympics.
The garden features plants and trees from places with Mediterranean climates including Australia, Chile, California, South Africa, the Canary Islands, and the western and eastern Mediterranean.
For hours and entry details see: museuciencies.cat/en/the-nat/venues/botanical-garden-of-barcelona/useful-information/
How to get there:
The closest metro stop is Plaça Espanya on the red line (L1) and green line (L3). From Plaça Espanya the Botanical garden is a substantial walk of about 2.5 km. Several buses (150, 13 or 55) will take you closer but still require a short walk.
The Historical Botanical Garden
The Historical Botanical Garden is a short walk from the Botanical Garden of Barcelona. Located in what were formerly quarries, it is situated behind the National Art Museum of Catalonia (MNAC). This garden was founded in 1930 and reopened in 2003. It is free to enter.
See also: Free Museum Days in Barcelona