This unreal Portuguese palace looks as though it's made from a pile of different castles.

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

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

The world's oldest bookshop still in operation.

Eat the ultimate iteration of Portugal's most beloved pastry.

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

This abandoned church was the site of one of the biggest art heists of the past decades.

Megachurch turned Catholic church comprised of 10,000 glass panes.

One of the largest helium balloons in the U.S. is a 112-foot ginormous orange.

This enormous World War II relic is one of the largest wooden structures in the world.

Try the frozen treat that inspired Arrested Development's famous banana stand.

Very likely the only museum in the world that celebrates the glory of the humble banjo.

Seriously good slices of Sicilian pizza lurk at the back of the Bronx's oldest enclosed market.

The private train station King Leopold II built for the Belgian royal family now lies abandoned.

Elaborate mansions built by Roma residents in Soroca to show their success after centuries of discrimination.

This 13th century Orthodox monastery is built right into the Moldovan cliffside.

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

Seventy-five miles of limestone caves host more than a million bottles of wine beneath a sleepy Moldovan town.

This abandoned Soviet circus is slowly being restored to its Communist-era glory.

This sign marks the entrance to a tiny proto-state within the small country of Moldova.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

The modern birthplace of Irish freedom.

A mysterious plaque to the even more mysterious "Fr. Pat Noise," killed in "suspicious circumstances."

This center tells the story of one of the most famous battles in Irish history.