Ethiopia doesn't ease you in. It has its own calendar (seven years behind), its own clock (sunrise is 12 o'clock), its own alphabet, and a Christian civilization that was carving churches out of mountains while most of Europe was still arguing about mud. The historic northern circuit is the classic route, and two weeks is the honest minimum. Check current security advice for each region before you go — the situation has shifted several times in recent years — and build slack into your plans.
Addis Ababa
Give the capital a day or two. See Lucy's 3.2-million-year-old bones at the National Museum ($0.50 entry, unbelievably), eat your first injera with shiro at a local place for $2–3, and drink the coffee — Ethiopia invented it, and a full ceremony with roasting pan and incense costs a dollar and an hour of your afternoon. Arriving on Ethiopian Airlines internationally cuts your domestic fares roughly in half, which matters, because flying the circuit ($60–120 per hop otherwise) saves brutal 12-hour bus days.
Bahir Dar and Lake Tana
Fly to Bahir Dar (or take the long bus, $10 and a full day) on the shore of Lake Tana, the source of the Blue Nile. Boat trips ($15–25 shared) cross to the Zege peninsula monasteries, where round churches hide walls of saucer-eyed saints painted in reds and golds; some monasteries admit women, some don't, so ask before you commit. A short bajaj-and-hike combo gets you to the Blue Nile Falls at Tis Issat — best in the rainy-season aftermath, September to November, when it earns its name, "smoking water."
Gondar, the Camelot of Africa
Three to four hours north by minibus ($5), Gondar was the imperial capital in the 1600s, and its walled Royal Enclosure holds half a dozen basalt castles that look airlifted from Portugal by way of Aksum ($10 entry). Don't miss Debre Berhan Selassie church, whose ceiling is ranked rows of painted angel faces — one of the most photographed rooms in Africa, and quieter than that suggests at 8am. Gondar is also where you organize the Simiens.
Trekking the Simien Mountains
This is the reason to come. The Simien escarpment drops a vertical kilometer from a 3,600–4,000m plateau, and you walk along the lip of it for days. Treks start from Debark (2 hours from Gondar), where park rules require a scout — an armed park ranger, usually a man of few words and superb pace — and most people add a guide, cook and mule through a Gondar or Debark agency. A three-to-four-day trek from Sankaber to Geech and Chenek runs $200–300 per person all-in for a small group. You will walk through troops of two hundred gelada monkeys who part around you like water, watch lammergeiers surf the thermals below your feet, and sleep in a tent at 3,600m where the nights drop near freezing even in the dry season (October to March; bring a real jacket). Fit parties can add Bwahit pass or even Ras Dashen, the country's 4,550m high point.
Axum and Lalibela
From Gondar, fly (or take the spectacular Limalimo road when conditions allow) to Axum, the ancient capital: fields of giant granite stelae, tombs, and the chapel that claims — politely but absolutely — to hold the Ark of the Covenant. Then fly to Lalibela for the finale. The eleven medieval churches here weren't built; they were excavated, cut downward into the rock as one piece, and Bet Giyorgis — a perfect cross-shaped church standing in its own 12-meter pit — is the single most astonishing building we've seen anywhere. Entry is $50 for all churches over multiple days. Come at 6am when the white-robed pilgrims outnumber tourists fifty to one and the chanting rises out of the ground itself.
Practicalities
Budget $40–60 a day plus flights and trekking. Carry cash (ATMs exist in every circuit town but trust them loosely), learn "amesegenallo" (thank you), and say yes to every coffee invitation. That's where Ethiopia actually happens.