Of course Salvador Dalí lived in a castle...

Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

An enchanting monastery in the Spanish countryside appears lifted from a fantasy tale.

Stunning Roman aqueduct used for 1900 years and still standing.

Bacteria and algae give the salty water its bubblegum hue.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

Wonderland replication in progress by one persistent man.

Thirty creepy ghosts now inhabit this decaying 14th-century church.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

An abandoned Indian-inspired mansion.

An off-the-beaten-path place to literally hang beneath Milwaukee's Holton Street Bridge.

To enter the lower hall of this temple, you must first walk through a dragon.

Abandoned waterpark turned counter-culture mecca.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

A temple to modernity, tucked away amid Barcelona's more well known museums.

Turntable anonymously received orphans, alms, and groceries.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

Week-long block party becomes a competition for the best decorated street.

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

Mountain where Jesus was first tempted by the Devil.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

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