The 400-year-old remains of the samurai invasion of Korea.

This ancient Corinthian helmet is South Korea’s only national treasure of Western origin.

A symbol of hope, survival, and national character, especially after it rose phoenix like from the flames.

Visit the real-life site of the fictional pizzeria in Bong Joon-Ho's film Parasite.

Collected from all around Seoul, thousands of secondhand books create this photogenic tunnel.

Home to more than 13,000 pieces of war memorabilia and military equipment.

The name of the only golden Buddhist temple in Korea translates as "the temple that protects the country."

A unique structure located on the grounds of one of five grand palaces that were built by the Joseon dynasty.

Started as a kitchen garden, now the second largest botanical garden in the world.

A Jenga-style cylindrical tower of books that appears to go on forever.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

It houses the remains of a 17th-century version of the Titanic.

Underneath this Byzantinian church lies a necropolis filled with ancient tombs and the ruins of previous churches.

"Holy Wisdom" overlooks the city that became its namesake.

"Unity, Creativity, Beauty."

A striking symbol of the Bulgarian capital.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

Portugal's National Pantheon has a history of curses, collapses and financial problems.

This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

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

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

The world's oldest bookshop still in operation.