Turkey’s (officially the Republic of Türkiye) magnificent Hagia Sophia is a riot of swooping domes and mismatched minarets added throughout its long life. The lofty interior is a soaring sequence of domed and arched spaces, centering on the shell-like apse and the massive dome, which seems to float unsupported and gives the church its amazing sense of space. Work continues to uncover the golden Christian mosaics and colorful frescoes from the Byzantine era, which were plastered over by the Ottomans.
Tours often allow you to skip the long lines with a guide, and many Istanbul excursions combine the Hagia Sophia Museum with other sights in Istanbul’s Sultanahmet neighborhood, including the Blue Mosque, Hippodrome, Grand Bazaar, and Basilica Cistern.