This mundane post marks the old location of the city's main postal hub.

A scattered trail of street art adds a pop of color to the city's stark structures.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

The Underground Railroad passed right through this historic Brooklyn Heights church.

On this stunning Scottish island, you can walk in the footsteps of dinosaurs.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

The most playful of the life-sized statues that make up Singapore's "People of the River."

The largest pool at its elevation sits on top of one of the most expensive resorts in the world.

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

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

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

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

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

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

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

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

At a museum of everyday objects, it is the act of collecting that is really on display.

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

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

The winter home of millions of migrating monarch butterflies.

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

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

Supposedly this Ethiopian chapel holds the Ark of the Covenant, guarded by virgins who cannot leave the building.

Massive stele returned to Ethiopia after 70 years in Rome.