Casma: Peru's Coastal Gateway to Ancient Civilizations

Casma sits 370 kilometers north of Lima on the Pan-American Highway, a sun-scorched town that most travelers pass through without stopping. That's a mistake. Within 20 minutes of the central plaza you'll find the stone carvings of Sechín, and 30 minutes further south lies Chankillo, a 2,300-year-old solar observatory that earned UNESCO World Heritage status in 2021. The town itself is unpolished — dusty streets, mototaxis weaving between fruit stalls — but it serves as the most practical base for exploring a stretch of desert valley that holds some of the oldest monumental architecture in the Americas.

Getting There and Orientation

Casma is the capital of its province in the Ancash region, sitting at just 210 meters above sea level. That low elevation explains the nickname locals use: Tierra del Eterno Sol, land of the eternal sun. The climate stays warm year-round, with daytime highs averaging 24°C and rainfall so scarce that some years pass with barely 60 millimeters total.

From Lima by Bus

Buses run from Lima to Casma in about 6 hours, covering roughly 370 kilometers. Several companies — Tepsa, America Express, and Movilbus among them — depart from terminals like Plaza Norte and Javier Prado. Fares start around 40 soles (about $11 USD) for standard service, with more comfortable options closer to 60 soles. Buses leave throughout the day, with the first departures around 11:15 and the last near 22:30. Book at least a day ahead if you're traveling on a weekend or during Peruvian holidays.

I'd recommend the earliest bus you can stomach. The coastal route passes through barren desert and irrigated fields, and arriving by early afternoon gives you time to visit Sechín before it closes at 16:30.

By Car

Driving from Lima takes about 5 hours without stops, following the Pan-American Highway north and taking the Pasamayo variant to avoid the worst of Lima's traffic. The road is in good condition and well-maintained. Renting a car gives you the flexibility to combine Casma with nearby beaches like Tortugas or the remote Dos Hermanas — the latter requires a 4x4 for the sandy access road.

Getting Around Town

Casma has no public bus system, but mototaxis (three-wheeled taxis) cover any trip within town for 3 soles or less. A ride to Sechín should cost no more than 5 soles, and Chankillo around 20 soles — negotiate before you get in. Shared mototaxis are common, and drivers are happy to pick up extra passengers along the way.

The Archaeological Sites

Casma's valley holds two major archaeological complexes, each distinct in age and purpose. Together they justify a full day of exploration, though you can see both in a single afternoon if you start early.

Sechín: Stone Carvings and a Bloody Past

Sechín is the closer of the two, about 5 kilometers east of town on the road toward the mountains. The site dates to roughly 1600 BCE and consists of a stepped platform faced with stone blocks carved in bas-relief. The carvings depict skeletal figures, dismembered bodies, and what appear to be warriors — a grisly scene that some archaeologists interpret as a record of battle or ritual sacrifice. The museum on-site, Museo Regional de Casma "Max Uhle," displays artifacts from the region, though its collection is modest. It's open Tuesday through Sunday, 9:00 to 16:30, with a small entrance fee.

Sechín takes about an hour to see properly. The carvings are weathered but still legible, and the setting — a flat desert plain with hills in the distance — adds to the sense of antiquity. There's little shade, so bring water and a hat if you visit midday.

Chankillo: The Thirteen Towers

Chankillo is the more impressive site, though it's harder to reach. Located about 15 kilometers south of Casma, it consists of a hilltop fortress and thirteen stone towers arranged in a line along a ridge. The towers function as a solar observatory: from a specific viewpoint to the west, the sun rises behind different towers throughout the year, allowing ancient astronomers to track the solstices and the agricultural calendar. The precision is remarkable — the alignment is accurate to within a few days of the actual solar events.

UNESCO added Chankillo to its World Heritage list in 2021, recognizing it as the oldest known solar observatory in the Americas. The site is free to enter, but there are no facilities, no signs explaining the astronomy, and no guards on-site. A local guide adds considerable value here — without one, the towers look like little more than piles of rock. Tours from Casma cost around $11 to $43 USD depending on group size and duration; Civitatis lists a sunset tour that includes transport and a guide.

Wear sturdy shoes. The ground is sandy and uneven, and the climb to the fortress involves a steep, unmarked path. The site is exposed to wind and sun; I'd avoid the midday heat and aim for late afternoon, when the light softens and the shadows make the towers easier to photograph.

Other Sites in the Valley

Sechin Alto, a massive platform mound about 1.5 kilometers from Sechín, dates to the same period and covers more than 300 hectares. It's less visited and less restored, but worth a look if you have time. Las Aldas, a coastal site with ruins of a ceremonial complex, sits about 30 kilometers south of Casma on a remote stretch of shoreline. Reaching it requires a car and some patience with dirt roads.

Beaches and Natural Areas

Casma's coastline holds several beaches that see few foreign visitors. Tortugas is the most accessible, a fishing cove about 20 minutes south of town with a handful of seafood restaurants and calm water for swimming. The beach itself is pebbly, not sandy, but the setting is pleasant.

Dos Hermanas, also called Las Gemelas, is a wilder option — a pair of crescent beaches framed by rocky headlands, reachable only by a sandy track that demands a 4x4. There are no facilities, no lifeguards, and no shade. Go with a local driver who knows the route; the sand shifts, and getting stuck is a real possibility. The reward is one of the last undeveloped beaches on Peru's northern coast.

When to Visit

The best time to visit Casma is April through June, when the weather is clear and the crowds are thin. Temperatures hover around 25°C during the day, dropping to 17-18°C at night. The summer months of December through March are hotter and more humid, with occasional rain — unusual for this desert region but increasingly common during El Niño years. July through September brings cooler, overcast mornings, though the sun usually breaks through by midday.

One thing to keep in mind: the sun here is brutal. Even on hazy days, the UV index can reach extreme levels. Sunscreen, a wide-brimmed hat, and long sleeves are not optional if you're spending hours at archaeological sites.

Frequently Asked Questions

How long do I need in Casma?

Two nights is enough to see Sechín and Chankillo without rushing. Add a third night if you want to visit the beaches or Las Aldas. Most travelers use Casma as a one-night stop between Lima and Trujillo or Huaraz.

Can I visit Chankillo without a tour?

Yes, but you'll need your own transport or a hired mototaxi (around 20 soles each way). The site has no staff, no signage, and no facilities — a guide is strongly recommended to understand the astronomical alignments. Tours bookable through Civitatis include transport and a bilingual guide.

What are the opening hours and entrance fees?

Sechín is open Tuesday to Sunday, 9:00 to 16:30, with a small fee (under 10 soles). Chankillo is open daily, free of charge, though access may be restricted during maintenance or research work. Fees are subject to change — check with the Museo Regional de Casma for current rates.

Is Casma safe for travelers?

The town is generally safe during daylight hours. Take normal precautions at night, and avoid walking alone on the outskirts. Mototaxi drivers are accustomed to tourists and will often help arrange transport to the archaeological sites.

What should I pack for a day of site visits?

Bring at least 2 liters of water per person, sunscreen with high SPF, a hat, and closed-toe shoes for Chankillo's uneven paths. There are no shops or vendors at either archaeological site, so buy supplies in town before you go.