Inside a busy metro station, an impressive mural depicts the prehispanic city of Tenochtitlán.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

These spectacular, symbolic serpents lie within the shadow of the Great Temple.

An extravagant 18th-century fountain built with bits of broken ceramic.

This colossal ancient sculpture of the monstrous Aztec rain god has a literally stormy history.

This foreboding building was the headquarters of the terrifying Spanish Inquisition in Mexico.

On a cornerstone of the City Museum is the head of a monstrous serpent stolen from an Aztec pyramid 400 years ago.

This incredible college library is a visual masterpiece of mosaic art. It also looks kind of like a giant boombox.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

The ruins of an ancient temple to the Aztec wind god discovered in the middle of a metro station.

This strange sculpture of a menacing skull surrounded by sun rays was discovered at the foot of the Pyramid of the Sun.

Where layer cakes tower above one’s head and there is never a shortage of icing.

A scientific repository of goiters, boils and other ailments throughout Mexican history.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

Part bookstore, part café, and part forest.

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

An island filled with hundreds of hanging, decomposing, decapitated dolls.

The splendor of this 17th century golden chapel has led it to be called the "eighth wonder of the world."

This beautifully deceptive waterfall is something far different from what it appears to be.

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

An indigenous take on European design creates a stunning visual overload.

A 500-year-old series of tunnels long believed to be folkloric was uncovered beneath the streets of Puebla.