The 16th-century Jesuit Igreja de São Roque, with its unremarkable exterior, houses a spectacularly opulent interior, given a lavish makeover with Brazilian wealth. The undisputed highlight is the Capela de São João Baptista, crafted from sumptuous materials such as amethyst, alabaster, lapis lazuli and Carrara marble. The museum, adjoined to the church, is brimming with extravagant religious art and holy artifacts.