Every inch of this chapel is covered in craftsmanship from across the world.

This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

Why a column on the entrance is inscribed with a verse from the Quran is one of Sicily's many mysteries.

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

Haunting graffiti left by prisoners of the Spanish Inquisition.

This uncanny fresco celebrating the "triumph of death" was split into four pieces to be moved to another museum.

This Arabesque Italian castle was built with a primitive, if ingenious, air-conditioning system.

The holes in this wall provide a glimpse into Jewish life in Budapest, both past and present.

A plaque bearing the names of those who dedicated themselves to protecting Budapest's Jewish population during World War II.

The metal leaves on this tree are engraved with the names of Holocaust victims.

This sculpture honors the man who was known as the "Righteous Among the Nations."

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This building has survived for more than a century and remains virtually untouched.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

A highly-criticized monument in Budapest has become the site of a makeshift Holocaust memorial.

This memorial to a murdered empress took 20 years to design, then spent 30 years hidden away in storage.

Once the home of a hermetic monk, this cave now houses a small church.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

The Hungarian biochemist whose research helped develop mRNA-based vaccines for Covid-19.

A 13th-century convent where St. Margaret of Hungary spent her teenage years.

On a teardrop-shaped island in the Danube, the ruins of a convent and the final resting place of a saint.

A controversial “crumpet”-shaped museum tries its best to blend in with surrounding parkland.

A statue built to honor the elite soldiers who fought for Latvia during World War I.

Latvia’s first skyscraper, nicknamed ‘Stalin’s birthday cake.’