In the Foundry theme at Squarespace they are using three fonts.

The large one is Playfair Display.

I'm wondering if anyone know what the other two are?

The italic ("Modernism") and the all caps-font.

See the site here:
https://foundry-demo.squarespace.com/

Thanks! /M

Minion  Suggested by jerseygirl 
Lato  Suggested by jerseygirl 

Neomodernism

Thanks! Great work! :-)