If you’re a fan of the macabre, this ode to mortality beneath Santa Maria della Concezione dei Cappuccini is essential viewing. The crypt is decorated with the bones of 3,700 Capuchin friars, arranged on the walls in ornate patterns.
“The reflection that he must someday be taken apart like an engine or a clock…and worked up into arches and pyramids and hideous frescoes, did not distress this monk in the least. I thought he even looked as if he were thinking, with complacent vanity, that his own skull would look well on top of the heap and his own ribs add a charm to the frescoes which possibly they lacked at present.”
— Mark Twain, The Innocents Abroad, 1869
While you’re in the area, check out the nearby Piazza Barberini with its Triton Fountain, sculpted by Baroque master Bernini in 1642.
Via Vittorio Veneto, 27