When booking your Orvieto hotel room, do yourself a favor and ask them to also book you a table at this little vaulted room behind a vine-covered entrance on a side street. Reserving well in advance is the only way you’re likely to eat here. Don’t expect gracious service or even a smile from grumpy proprietor Averino. Still, for more than 40 years he’s been serving what many diners claim is the best carbornara they’ve ever eaten—and that’s enough to attract customers by the busload from the ends of the earth. The kitchen also prepares other pastas and grills meat, but you’re only here for the standout attraction.