Qualla: Guayabo National Monument

Guayabo National Monument: Introduction

Sun, 22 Mar 2026 00:00:00 GMT

Photo credit Lutz Maertens, CC BY-SA 3.0. Nobody knows why they left. Sometime around 1400 CE, roughly 10,000 people abandoned a thriving city on the southern slope of Turrialba Volcano and walked into history without explanation. A century later, the Spanish arrived in Costa Rica and found no one living at Guayabo de Turrialba. The jungle moved in, burying stone foundations, aqueducts, and roadways under centuries of growth. Today, only a small fraction of the 2.3-square-kilometer site has been excavated, and the mystery of its abandonment remains unsolved. Disease, warfare with rival civilizations, internal collapse - researchers have speculated about all of these and confirmed none. What they have confirmed is that the people who built Guayabo were remarkable engineers, and the American Society of Civil Engineers agreed: in 2009, the organization declared Guayabo an International Historic Civil Engineering Landmark.

Image: Lutz Maertens | CC BY-SA 3.0

Guayabo National Monument: Engineers of the Cloud Forest

Sun, 22 Mar 2026 00:00:00 GMT

Photo credit elisabeth tonglet, CC BY-SA 2.0. The excavated portion of Guayabo reveals a city that was planned, not improvised. Forty-three stone foundations mark where conical wooden structures once stood - large communal houses with thatched roofs where extended families lived together. Three aqueducts channeled water thro...

Image: elisabeth tonglet | CC BY-SA 2.0

Guayabo National Monument: From the Jungle to the World's Fair

Sun, 22 Mar 2026 00:00:00 GMT

Photo credit elisabeth tonglet, CC BY-SA 2.0. The site was first discovered in the 1800s and initially excavated in 1882. Nine years later, a cemetery excavation yielded over 100 artifacts that traveled far from the Costa Rican jungle. They were displayed at the 1892 Historical American Exposition in Madrid, then shipped acr...

Image: elisabeth tonglet | CC BY-SA 2.0

Guayabo National Monument: The Unexcavated Majority

Sun, 22 Mar 2026 00:00:00 GMT

Photo credit elisabeth tonglet, CC BY-SA 2.0. What visitors see today is believed to be the central portion of the site - and even that represents only a fraction of the whole. The vast majority of Guayabo remains underground, untouched by excavation. Recent studies have used remote sensing techniques to detect and map burie...

Image: elisabeth tonglet | CC BY-SA 2.0

Guayabo National Monument: Rainforest Guardian

Sun, 22 Mar 2026 00:00:00 GMT

Photo credit Steve L. Martin, CC BY 2.0. The monument has been open to the public since August 13, 1973, and its relative obscurity has been a form of protection. Where Machu Picchu receives over half a million visitors annually, Guayabo sees far fewer, making preservation easier and the experience more intimate. The si...

Image: Steve L. Martin | CC BY 2.0