Colosseum
Start here, first thing, before the heat and the queues. If you have pre-booked a timed slot you can do a fast interior loop, but on a single day the exterior and the Forum tell the story just as well and save you the interior line. The standard ticket (around 18 euros, about $20) also covers the Roman Forum and Palatine Hill, valid 24 hours with one entry to each, so it is not a wasted spend if you go in. Buy online days ahead either way: it sells out from spring through autumn.











