The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

One of the world's largest murals covers a large swath of homes in its hillside neighborhood.

This stunning and ethereal mural symbolizes the beauty, unity, and diversity of humankind.

The ruins of the bathhouse used by the ill-fated last Aztec emperor still lie in Chapultepec Park.

This tiny garden was built specifically to provide a place of peace and serenity away from the busy city streets.

This laboratory has a remarkable concrete roof that measures less than an inch at its thickest point.

A "time traveler's" vision of human history stretches throughout Mexico City's Copilco metro station.

A gigantic, symbolic artwork covers the side of the building.

A jewel of the Mexico city skyline now slowly crumbles after surviving an earthquake.

This mid-century mural portrays humankind's spiritual and scientific journey.

The now-public home of a renowned art collector is full of unique pieces from viceregal and 19th-century Mexico.

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

A small building that loosely resembles a tooth is appropriately used as a dentist office.

This museum houses two of Mexico's most impressive Aztec monoliths.

Sample sweets at an Art Nouveau candy shop that's been in business since 1874.

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

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

A shining treasure trove of fine Mexican silver dating back to the 15th century.

These museum grounds are a Dalai Lama-declared peace oasis.

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

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

The Mexican painter Diego Rivera created this unusual museum to display his collection of pre-Hispanic artifacts.

The last home designed in its entirety by noted architect Luis Barragán owes its existence to an impressive jacaranda tree.

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