Examples of websites using
Neue Haas Unica
('Neue Haas Unica' is a Sans Serif font designed by Toshi Omagari and released by Linotype in 2014. This font family consists of multiple styles, including regular, light, bold, and italic variants)
with
Big Caslon
(Big Caslon is a serif font designed by Font Bureau. It has multiple styles, including regular, italic, bold, bold italic, and black)