Ancient Roman mosaics.

I declare it to be hot classicist summer. Go read your Latin.

Paintings by German expressionist Gabriele Münter.

Portraits by American artist James McNeill Whistler.

Prints by Namibian artist Lok Kandjengo.

Seaside paintings by Brazillian modernist Anita Malfatti.

Somewhat famously, Malfatti attempted to introduced modernist painting to Brazil's then-famously conservative art scene. The resultwent about as well as one might expect.