An exact replica of a colossal Olmec head sits atop a pyramid within a Madrid traffic circle.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

One of Europe's largest supercomputers is housed inside of a disused chapel.

An enchanting monastery in the Spanish countryside appears lifted from a fantasy tale.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

Phil Mortillaro uses keys to bring art back to the Village.

A notorious punk house turned co-op.

America's oldest Eastern European synagogue provided the immigrants of crowded Lower East Side tenements a space of sanctuary.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

Cryptic messages embedded in the New York City sidewalk.

Order scoops of pandan, lychee, and black sesame at this family-run institution.