This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

Artistic tombs, monuments, and a beautiful "Hall of Fame" lurk inside this cemetery.

Ancient catacombs form the foundation for this Rococo orgy of a church.

The stunning interior of this Gothic church is covered in ornate gold details.

An interactive back-alley mural project remembers the golden age of Kuala Lumpur’s Chinatown.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

A daily pyrotechnic celebration marks a beloved tradition during Valencia's festival season.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

This magnificent market stands as a poignant symbol of the suffering caused by the Spanish Civil War.

Down this yellow brick road, visitors are treated to toadstool houses and massive mushroom sculptures.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

The hidden ruins of an old hydroelectric plant reclaimed by nature.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

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

This small chapel is built of human bones and decorated with a golden skeleton.

Hidden beneath a beautiful overlook you’ll find the history of the city depicted in comic strip format next to a pay toilet.

The world's oldest bookshop still in operation.

Elaborate tile work in this railway station tells the story of Portugal.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

One of the oldest temples in Ho Chi Minh City, dedicated to a deified Chinese military leader.

This Khmer temple is named after a young woman who sacrificed herself to protect the city from a disastrous deluge.

When the USA donated cement and funds to expand the airport in Laos, the Laotians built a massive monument instead.