Elevated freight railway turned wildly successful urban park.

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

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

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

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

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

The former sign of this immortal music venue is just that--undying.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

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

Where now stands a 42-story condominium tower of marble, glass and steel was once the central market of New York’s slave trade.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

The sister plane of the C-123 shot down during the Iran-Contra Affair has found a new purpose in retirement.

The small cliffside monastery known as the Tiger's Nest is said to be the meditation site of an eighth-century Buddhist master.

This Himalayan airport provides one of the most difficult landings in the world.

This penis-focused monastery is dedicated to Buddhism's "Divine Madman."

This blowhole is supposedly caused by a trapped monster.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

These ancient sacred grounds granted amnesty to those who managed to reach them.

What remains of the summer palace of King Kamehameha III.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

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

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

The oldest farmer's market in America is so ancient it was approved by the King of England.