The walls and streets of the ancient city are peppered with penises.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

An ancient burial ground believed to have been used for ritual sacrifice.

Thousands of well-dressed mummies below a monastery.

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

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

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

A plaque honoring a Hungarian hero of Italy is hidden in plain sight in Palermo.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

On the wall of this medieval square, a symbol of the Spanish Inquisition.

This garden houses the remains of the ancient Greek port of Marseille.

Originally conceived as part of a proposed Arizona State Capitol building in the 1950s, this structure built in 2004 stands as a monument to the architect's legacy.

The "3rd largest" city in California is an empty mirage of suburbia in the middle of nowhere.

This dormant volcanic crater has been converted from a roiling pit of magma to a pleasant hiking spot.

A pair of large white marble lions guard this stretch of the Mojave Desert, and it is utterly mysterious how they got there.

The ghost town that ended up on Ebay.

One of the oldest producers of hand-folded fortune cookies still uses its original secret recipe.

The exterior of this home was used for the hit television show, The Brady Bunch.

Formerly the world's largest, this Willy Wonka-esque contraption runs 24/7.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.