A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

This experimental utopian "city of the future" in rural India may hold a dark secret.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This city park was once a lookout point for George Washington’s army during the Battle of Brooklyn in 1776.

Elevated freight railway turned wildly successful urban park.

France's most famous cemetery, with some of its most curious tombs.

A controversial memorial at the place where Captain Cook met his violent end.

This black shoreline is made up of exploded lava particles.

What remains of the summer palace of King Kamehameha III.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

An easy to overlook storefront hides some of the most authentic and regionally diverse Chinese food in New York.

The "Seinfeld" diner.

Mysterious 500-year-old tapestries depict a unicorn hunt.

The most confusing clock in New York.

While many places make the claim, the Library of Congress says this restaurant is the birthplace of the hamburger.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

"Only the devil could play golf here."

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

Version of the French Riviera destroyed by the sea.