Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A semi-scholarly approach to sex.

Elevated freight railway turned wildly successful urban park.

Try not to get slimed in Tribeca.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

This private residence was the template for one of the most beloved television homes of all time.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

Europe's official "zero-level," the equator of elevation.

A public urinal so pretty, it was declared a national monument.

This colossal ancient jaguar sculpture was used as a vessel for the hearts torn from sacrificial victims.

The turquoise-studded skull of a long-dead Aztec man sits within Mexico City’s Museum of Anthropology.

The unique collection often goes unnoticed by visitors focused only on the archaeological objects.

One of the world's richest men bought this former paper factory and transformed it into a mall.

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

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

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.

Mexico City's largest market contains a Willy Wonka-esque wonderland.

These biodiverse university gardens form a green oasis amid the urban chaos of Mexico City.

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

The only castle in North America to ever house European sovereigns.

A museum in the former home of Marxist revolutionary Leon Trotsky.

A crumbling hospital from the 1850s on Roosevelt Island.