Borghese Gallery

You must book ahead. This is not a suggestion - the Borghese Gallery limits entry to 360 people every two hours, and slots sell out weeks in advance during peak season. If you show up without a reservation, you will not get in. Book at galleriaborghese.beniculturali.it (the official site, not the third-party resellers who charge double) 2-3 weeks ahead, earlier in summer.

That mandatory booking is actually one of the gallery's greatest features, because it means you'll see Bernini's Apollo and Daphne without fighting through a crowd. And you need to see it. The marble looks like actual skin - Daphne's fingers are turning into laurel leaves, Apollo's hand is pressing into her waist, and you can see the exact moment of transformation. It's the single most impressive piece of sculpture in Rome, and Bernini carved it at 24. The Rape of Proserpina, in the next room, has the same impossible quality: Pluto's fingers pressing into Proserpina's thigh create dimples in the marble that shouldn't be possible.

The €15 entry is a bargain for what's arguably the best small art museum in the world. Two floors: ground floor is sculpture (Bernini, Canova), first floor is paintings (Caravaggio, Raphael, Titian). The Caravaggio room alone - Boy with a Basket of Fruit, David with the Head of Goliath (where Goliath's face is Caravaggio's self-portrait), and the raw, unflinching Madonna dei Palafrenieri - is worth the ticket.

The 2-hour time limit sounds restrictive but it's actually perfect. It forces you to see a manageable collection without the museum-death-march exhaustion that hits at the Vatican or the Uffizi. You'll leave wanting to come back, which is the sign of a great museum. The gardens around the gallery (Villa Borghese park) are free, beautiful, and ideal for decompressing afterwards - rent a rowboat on the lake (€3 for 20 minutes) or just sit on a bench and process what you've just seen.