These five Art Deco homes were meant to solve the "small house problem."

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

Hidden within an idyllic suburban garden is a memorial dedicated to the victims of a terrifying spree of killings committed on U.S. soil.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

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

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

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

CDMX's home for the world's culinary delights.

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

This "City of Books" holds a museum, library, and the complete personal book collections of five of Mexico's greatest thinkers.

This neon installation is a tribute to a Mexica god, who gave his skin to humanity.

In Chapultepec Park there is a pavilion gifted to Mexico from South Korea to honor the 1968 Summer Olympics.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

Montreal's giant farmer's market is a foodie's best friend, especially in the winter months.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

Housing the National Women's Party since 1929, this historic house is now a monument to the fight for gender equality.

A grand entrance to one of the world's smallest Chinatowns.

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

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

Explore the atmospheric ruins of an abandoned convent in the dense forests of Mexico's first national park.

The burial place of some of Mexico's most prominent residents is full of macabre stories and hidden masonic symbols.

This ancient structure was built by a mysterious civilization that was largely destroyed by a volcanic eruption.

This crumbling Art Deco movie palace in Mexico City has been abandoned for two decades.