This ancient market is often referred to as the oldest shopping mall in the world.

Legend has it that this bronze orb, which sat atop an ancient Egyptian obelisk, once held the ashes of Julius Caesar.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

A massive bridge forms part of an aqueduct that was deemed an architectural wonder of its time.

This monumental fountain has moved around the city multiple times.

These bronze horses on the gates of the Royal Palace of Naples were a gift from a Russian tsar.

This whimsical fountain depicts a winged siren shooting water out of her nipples into the fires of Mount Vesuvius.

This medieval city gate is now a blend of the past and the modern world.

For centuries, this large Roman villa remained hidden thanks to the eruption that buried nearby Pompeii and Herculaneum.

A narrow opening between the mountains of the Amalfi Coast creates a scenic hidden beach.

This seaside Italian village doesn't just look Escher-esque, it actually inspired the mind-bending artist.

A crumbling watchtower and a lighthouse overlooks the site believed to be the Sirens' cliff in the "Odyssey."

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

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.

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

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

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

Giant, friendly pelicans in Central London, the most unlikely of places.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

London's smallest police station is barely the size of a phone booth.

A fantastic castle rumored to be the birthplace of King Arthur.