If you're in Istanbul/Beyoğlu and interested in visiting museums, here are some notable museums you should consider exploring:

1. Istanbul Modern: Located along the Bosphorus, this museum focuses on contemporary Turkish art, including paintings, sculptures, and multimedia installations.

2. Pera Museum: Situated in the historic Pera district, this museum houses collections of Anatolian weights and measures, Kutahya tiles and ceramics, and Orientalist paintings, among other exhibits.

3. Istanbul Archaeology Museums: Just a short distance from Beyoğlu, these museums comprise three main sections: the Archaeological Museum, the Museum of the Ancient Orient, and the Tiled Kiosk Museum. They showcase artifacts from various civilizations, including ancient Greek, Roman, and Anatolian artifacts.

4. Rahmi M. Koç Museum: If you're interested in industrial and technological history, this museum near the Golden Horn offers exhibits on transportation, communications, and innovations in Turkey.

5. Galata Mevlevi Museum: This museum is housed in a former dervish lodge and offers insights into the mystical Mevlevi Order, including exhibits on Sufi traditions, rituals, and musical instruments.

These museums provide a diverse range of experiences, from contemporary art to ancient history and cultural heritage, allowing you to delve into Istanbul's rich and multifaceted past and present.