As of my last update in September 2021, here are five of the best museums in Amsterdam, known for their impressive collections and cultural significance:

1. Rijksmuseum: The Rijksmuseum is the most famous museum in the Netherlands and one of the most significant art museums in the world. It boasts an extensive collection of Dutch Golden Age paintings, including works by Rembrandt, Vermeer, and Frans Hals. The museum also exhibits decorative arts, historical artifacts, and a remarkable collection of Asian art.

2. Van Gogh Museum: Dedicated to the works of the legendary artist Vincent van Gogh, this museum houses the largest collection of his paintings and drawings. It provides visitors with a comprehensive overview of Van Gogh's artistic journey, showcasing his various phases and masterpieces.

3. Anne Frank House: A historically significant museum, it is the actual house where Anne Frank and her family hid during World War II. The museum presents a poignant and moving exhibition about the life of Anne Frank, her diary, and the impact of the Holocaust.

4. Stedelijk Museum: This museum focuses on modern and contemporary art, featuring an impressive collection of works by artists such as Piet Mondrian, Kazimir Malevich, and Willem de Kooning. It houses a diverse range of art forms, including painting, sculpture, photography, and design.

5. Hermitage Amsterdam: This branch of the famous State Hermitage Museum in St. Petersburg, Russia, showcases rotating exhibitions with art and cultural artifacts from the Hermitage's vast collection. It provides a unique opportunity to explore Russian history and culture from different periods.

Please note that museum offerings and popularity can change over time, so it's always a good idea to check for the latest information and reviews before planning your visit. Enjoy your time in Amsterdam!