An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Superstitious? Discover the witchy side of Mexico through its largest esoteric market.

Frida Kahlo's childhood home, now a museum of her life and works.

This park feels like a lush little jungle full of wildlife nestled within São Paulo.

This singular art museum in São Paulo is unique inside and out.

The pedestrian traffic signals in Brazil's teeming metropolis light up with clues to nearby landmarks.

As one of the world's largest hydroelectric dams this plant took two countries to get built.

This Brazilian town built by Freemasons is full of colonial Masonic architecture and symbolic imagery.

Crumbling remnant of Rio's colonial past tucked behind Corcovado mountain in the neighborhood of Cosme Velho.

This medieval manuscript collection has some of the most obscure and ancient texts in the world.

The world's longest nonstop reversible cable car soars through spectacular scenery to the medieval Tatev Monastery.

This ancient monastery complex was transformed from an island to a peninsula when the lake was partially drained.

Centuries before the modern seismograph, Armenian monks measured quakes with this tilting pillar.

This Armenian monastery was carved out of cliffs and named after the spear used to stab Jesus.

The most visited pilgrimage site in Armenia once held a saint in a pit for 13 years.

A Byzantine church containing the holy remnants of three saints sits atop the site of an ancient temple.

This 18th-century former mosque held the first Hellenic Parliament.

A Byzantine-era church hidden in a wooded area below the Acropolis.

The historic building has preserved human organs, unusual hexagrams, and scars from a political assassination.

The only surviving choragic monument is a trophy awarded in 334 BC for the winning dramatic chorus.

A staircase made of gravestones leads up to this church built into a giant rock.

This architecturally eclectic early-20th century mosque was built as a place of worship for the Islamic followers of a Jewish messiah.