Once located in Sintra, this astonishing 20th-and-21st-century-art collection now wonderfully serves as the main attraction at the massive Centro Cultural de Belém. Showcasing 70 artistic styles across more than 900 works, it comes courtesy of wealthy Portuguese businessman Joe Berardo, who has amassed a jaw-dropping assortment of abstract, surrealist, hyperrealist, minimalist, and Pop art, valued by Christie’s before the move to Belém at €316 million (around $392 million). Among the heavily American and European bent of the collection, must-see pieces include original works by Warhol, Basquiat, Lichtenstein, Hockney, Dalí, and Pollock. This being one of the world’s largest collections of modern and contemporary art, however, surprises lurk at every turn throughout the galleries. Although previously free, the museum now charges a small fee (except on Saturdays).