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 once grand hotel now sits eerily abandoned in the Catalan countryside outside Barcelona.

One of Europe's largest supercomputers is housed inside of a disused chapel.

Turntable anonymously received orphans, alms, and groceries.

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.

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

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

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

Read a book with a glass of wine at this classically restored bar.

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

An underwater city for the dead.

This illuminated sign was the first of its kind in Canada and remains a vestige of the Atomic Age.

These prehistoric replicas were based on actual skeletal remains.

Canada's subterranean Cold War museum has doubled as a movie set.

This Quebec estate is home to the elaborate gardens of a self-taught horticulturist.

A scenic overlook of a pit mine hundreds of meters deep filled with blue water.

A contemporary fresco movement illustrates the region's rich history.

A visionary, futuristic sculpture in Los Angeles that never met its extraterrestrial potential.

Secret US military film studio in the Hollywood Hills.

First LEED-certified gas station in the United States.

What began with a single, 357-pound chunk of the Canyon Diablo meteorite grew to be an impressive collection. 

One of the world's largest collections of rare and magnificent bird specimens.

This forgotten Frank Lloyd Wright house is an architectural marvel at the end of a sleepy residential street.

Two men, two visionaries of Venice Beach, one little hotel that smells like cookies.