This museum highlights artwork and design from Catalan modernism, a movement that flourished at the end of the 19th century. A top choice for art lovers who've already seen the big hitters, the museum has more than 350 works by some of the most prominent artists and architects of the time, like Antoni Gaudí, Ramon Casas, and Santiago Rusiñol, as well as a fascinating collection of furniture, ceramics, glass, and textiles.

It's easy to wander past Antoni Tàpies Foundation (Fundació Antoni Tàpies) on your way to nearby Casa Batlló, but this museum and cultural center is well worth a stop. Created by renowned artist Antoni Tàpies—one of Europe's most influential artists—the museum boasts a large collection of his works including paintings, sculptures, drawings, prints, and books. You'll also find temporary exhibitions featuring artists and movements related to Tàpies’ vision.

You'll find photo opportunities galore at Barcelona's Big Fun Museum. Home to thematic rooms such as the Magic Room, the Sweet Museum, and the Topsy-Turvy House, the Big Fun Museum brings eight museums together under one roof, and offers illusions and wonders to suit all ages. Wander through the hall of mirrors or get lost in the maze before checking out the ever-so-creepy Museum of Madness or chatting to the speaking flowers at Alice Through the Looking Glass.

While Barcelona is known for its great tapas, you can’t live by savories alone. Once you’ve finished a tapas crawl, it’s time for dessert, well, a dessert museum. The Chocolate Museum (Museu de la Xocolata) tells the story of chocolate's origins in America, its arrival in Europe, and its evolution across the world. Ideal for kids and adults alike, this underrated spot also is home to a collection of chocolate sculptures made to look like famous landmarks and characters from history and fiction.

This Gothic monastery-turned-museum was founded in 1326 by Queen Elisenda de Montcada, the wife of King James II of Aragon. Take a tour of the building—itself a stunning spot with beautiful architecture, stained glass windows, and an impressive altarpiece—to see preserved rooms, such as the kitchen and chapel, and areas that have been repurposed as galleries for the monastery’s art and treasures. Don't miss a chance to wander around the courtyards and verdant gardens.

As the only perfume museum in Spain, Barcelona's Museum of Perfume (Museu del Perfum) checks off all the boxes for a unique (and aromatic) day out. Here, you'll find nearly 5,000 perfume bottles and vessels from all across the world, ranging from ancient Egyptian, Greek, Roman, and Arabic artifacts to present day industrial bottles. The museum's top hits include a perfume box that belonged to Marie Antoinette and a scent bottle designed by Barcelona's very own Salvador Dalí.

The MUHBA Refugi 307, in the Parc de la Primavera in the Poble Sec neighborhood, is both a landmark and a museum: The structure is one of 1,000 air-raid shelters built in Barcelona during the Spanish Civil War (1936–1939) to protect citizens from bombings. Made up of 1,312 feet (400 meters) of tunnels, this shelter had space for up to 2,000 people. Today, visitors can see the different rooms, including bathrooms and an infirmary, as well as the graffiti people made on the walls during bombings.

Renowned for its unique exhibitions, the Centre de Cultura Contemporània de Barcelona CCCB (located next to the famed Barcelona Museum of Contemporary Art) is a cultural center that plays host to exhibitions, festivals, concerts, films, and even debates. While there, explore the “Artificial Intelligence” exhibition, which explores the past and the future of AI through talks, debates, and shows by international artists, scientists, and researchers.