A beautiful but toxic fountain of mercury.

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.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

A stately palace has been converted into the world's largest cannabis museum.

An unusual stroll through gentlemen's erotica demonstrates that pornography is timeless.

One of the most photographed buildings in a city known for its Modernista architecture is an abandoned squat.

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

The fairy tale castle of the "fairy-tale king."

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

The corpse bride of Portugal.

A majestic hotel for dreamers rises from the center of a fairytale wood.

Ancient catacombs form the foundation for this Rococo orgy of a church.

Picturesque intersection of witchcraft and ancient Christianity.

Elaborate tile work in this railway station tells the story of Portugal.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

A submerged village appears when dam levels drop.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

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

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

Morocco's Argania trees are infested with nut-hungry goats.

Single runway interrupted by a busy road that cuts across its middle.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

Mosaics, storks, and brothels—this ancient city has it all.