
Just two kilometers north of the Plaza de Armas, an ancient structure full of mysteries and history dominates the imperial capital from the heights: Sacsayhuaman. Known as the "Sacsayhuaman Fortress" due to its massive zigzag walls that protected the city, this site is more than a military defense. It was a great ceremonial temple dedicated to the sun and the Andean worldview.
Its limestone blocks are precision-built. Some weigh over 120 tons and reach 5 meters in height. This level of engineering and architecture is nothing short of astonishing. Tour this monument if you visit the city of Cusco and wonder what to do. You'll learn how a civilization without iron or the wheel could build this fortress.
Today, this archaeological complex is the most popular site for tourists in Cusco. This is because it offers a lesson in history and architecture, and it provides one of the most spectacular panoramic views of the city. Exploring the Sacsayhuaman fortress on a Cusco city tour is undoubtedly one of the best choices.
Sacsayhuaman is an archaeological site located 2 kilometers north of the Plaza de Armas in Cusco, at an altitude of 3,700 meters above sea level. This impressive complex extends over more than 3,000 hectares on a hill surrounded by mountains, offering panoramic views of the city and the valley. Its surroundings are full of history and nature, with abundant Andean flora and typical fauna, where llamas graze and falcons fly.
In 1450, the Inca Pachacutec—the ninth ruler of the Empire—ordered the construction of an impressive sanctuary. This sanctuary was built to celebrate the military victories of his son Túpac Yupanqui.
More than 20,000 workers were mobilized from different regions of the empire for this monumental project. They were recruited through the mitas system. They transported enormous blocks of stone from various quarries in Cusco and assembled them with amazing precision, achieving a perfect fit without the need for tools like mortar.
The architectural design of Sacsayhuaman was part of the great urban plan of Pachacútec, who designed the city of Cusco and gave it the shape of a puma, the sacred animal of the Kay Pacha (Andean earthly world). Sacsayhuaman represented the head of the feline, a symbol of strength and power.Note: Sacsayhuaman is a "fortress" in name only. Archaeological studies prove that it was a ceremonial center with strategic defensive capabilities.
In Quechua, Sacsayhuaman means "place where the falcon is satisfied." The name is undoubtedly related to the presence of these birds in the area, which were of immense importance in Andean culture. Its monumental design and giant walls make it clear that this was no ordinary fortress; it was also a very important ceremonial center.
The Spanish arrived in the 16th century, were impressed by its architecture and defensive appearance, and called it a "fortress." During the Inca rebellion of Vilcabamba in 1536, the site was key: Inca troops fought off a Spanish attack, confirming its military use.
Its construction began under the rule of the Inca Pachacutec in the 15th century and was continued by his successors, finishing in the time of Huayna Capac in the early 16th century. Later, in 1536, Manco Inca, the leader of the resistance against the Spanish, used Sacsayhuaman as a strategic bastion in one of the most significant battles of the era. After the conflict, the colonizers tore down much of the construction. They used its stones to build churches and houses in Cusco. Today, only about 20% of the original complex remains.
Sacsayhuaman is not just an Inca fortress. It was primarily designed as a ceremonial center and temple dedicated to the Sun (Inti), the supreme deity of the Inca culture.
Its location and the scale of its design also gave it a defensive role, making it a multifunctional space within the Inca Cusco organization.

Today, Sacsayhuaman is the perfect setting for the celebration of the Inti Raymi, or "Festival of the Sun." This festival is held every June 24 and revives the ancient Inca ceremonies in honor of the sun god. Thousands of national and foreign visitors gather on its esplanade to witness this artistic representation.
The fortress is a masterpiece of Inca architecture, renowned for its cyclopean construction: its walls are made of enormous blocks of stone that fit together perfectly, a technique that continues to amaze archaeologists and engineers today. These stones are massive. Some are 9 meters high, 5 meters wide, and 4 meters thick. They weigh an estimated 125 tons.
The complex has three stepped platforms, each 360 meters on average, connected by stairs and access doors that reveal the strategic planning of its design. The Throne of the Inca is at the top. It is carved directly into the rock and oriented towards the main esplanade. From there, the sovereign could witness ceremonies and military acts. The "Rodadero" is nearby. It's a natural formation of polished rock that the ancient Incas used for recreational purposes. Today, it's a curiosity for visitors.

Cunningham is the author of The Map That Talked, a book that delves into the mysteries of prehistory. It has departed from the more orthodox theories to suggest that the builders of Sacsayhuaman developed an intricate writing system that dates back 30,000 years. In that case, it would not be the Incas, but an advanced civilization of which we have lost memory.
This ancient form of writing is the basis of the geometric shapes that take into account the movement of the Moon and the Sun. According to his mystery of Sacsayhuaman, the astronomical values considered central to anticipating eclipses become "angular values." The stones of the monumental wall (see map) are made of these materials.
Astronomical terms define it as a combination of the values used to measure time (sidereal month: 27.32 days) and the values used to determine when the Moon, the Earth, and the Sun align at the nodes. This includes the moon's 18.6-year nodal cycle, the 6,511-day draconic month between eclipse seasons, and the 5.1-degree tilt of the moon's orbit. The rest of the values are either the values of the middle of the different lunar terms or values linked to the 11-day difference between the lunar and solar years.
He believes that this old way of writing was the foundation for the geometric shapes that were used to study the movement of the Moon and the Sun. According to his theory about Sacsayhuaman, the astronomical values considered central to anticipating eclipses become "angular values." These are the stones that make up the monumental wall (see map).
In the study of astronomy, it is a combination of two types of values. The first type is used to measure time. It is called the sidereal month, and it has a duration of 27.32 days. The second type is used to determine when the Moon, the Earth, and the Sun align at the nodes. This includes the moon's 18.6-year nodal cycle, the 6,511-day draconic month between eclipse seasons, and the 5.1-degree tilt of the moon's orbit. The other values are usually either the values of the middle of the various lunar terms, or values linked to the 11-day difference between the lunar and solar years.
Cunningham suggests that his analysis of the fortress of Sacsayhuaman is just one example of ancient writing based on astronomy. It has been found in many places around the world. The Ishango bone (Africa) and the stone (China) are some of the oldest examples of art and writing. The Ishango bone was carved with bones, and the stone was carved with tools about 30,000 years ago. This shows that people were using language and writing a long time ago.
Cunningham wants to know if the massive polygonal walls of Sacsayhuaman line up with the exact astronomical values used in the Muiscan figurines of Colombia and the giant Atacama of Chile. The surprising result is yes.
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Many tourists wonder how to get to Sacsayhuaman when they arrive in Cusco. Here are some ways to get to this impressive archaeological site:
Beyond the beautiful view of the city, the site has special buildings that stand out because of their history and interesting architecture. Here are the five most important things to know about the tour:

Chincanas of Sacsayhuaman
Sacsayhuaman has a dry and temperate climate. The average temperature per year is 12°C. There are two seasons: summer and winter. The rainy season, which is from November to March, is when the most rain falls. The dry season (from April to October) has hot days and cold nights.
To visit Sacsayhuaman, you need the Cusco Tourist Ticket. You could also choose to take a "City Tour."
Sacsayhuaman opens its doors from 7 a.m. at 6 p.m.
It is the most complete ticket because it includes more attractions (16). It is valid for 10 days from the day it is purchased. Here are the attractions included in the ticket:
With three possible circuits, it is perfect if you don't have a lot of money, since you can spend a little time in each place and visit specific attractions that interest you.

Beyond the beauty of Machu Picchu, the area around Cusco has many activities that will allow you to learn about the culture, history, and landscapes of the Andean region of Peru. From traditional towns to little-explored natural wonders, there is a lot to discover just a few kilometers from the imperial city. If you're looking for new adventures, here are some places you can't miss:
Inca Trail, Machu Picchu and more