This monastery set over a holy cave contains the oldest known painting of Saint Francis of Assisi.

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Venice's "Island of the Mad."

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Go inside to really appreciate this 500-year-old technological masterpiece.

This handsomely carved wooden church is more than 800 years old.

The Brutalist building harbors an unusual inverted dome that swoops down over its central sacred room.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

This Swedish astronomical clock was in storage for almost a century before its glorious workings were put on display once more.

The final resting place of the father of modern biological taxonomy.

Ancient burial grounds of the wealthy.

The official meeting point for the oddly named governing assembly of ancient Sweden.

The exhibition explores the Icelandic city's Viking Age history.

One of the oldest family businesses in Reykjavík serves lamb-based hot dogs.

This stunning concert hall has become a symbol of Iceland's national recovery.

A relatively obscure antihero from the Marvel Comics universe adorns a wall inside Iceland's main airport.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

This tiny museum's sizable collection is jammed into a former underground public toilet.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.