The venue chosen for the Pathways conference is the CosmoCaixa science museum in Barcelona.
A presentation of the museum can be found here

It is located within 15mn (by direct subway) from Plaza de Catalunya which is the heart of the city, with many hotels, and which has a direct train connection to the airport.

Features of the venue are:
> A 312-seat main auditorium — WiFi and power ports at all seats;
> A 220-seat side auditorium that can be converted into a 120m2 poster room;
> Two smaller rooms ("beta" and "gamma", 65 seats each) available for splinter sessions;
> A press room, and a separate office;
> Integration into the science museum and access to the exhibits

Pictures of the facilities can be found here